Completely uninstall Cygwin in Windows 10 64 bit

1. Check the c drive, cygwin has been installed, c:\cygwin64. as shown in Figure 1

Figure 1

2. Find cygwin64 Terminal in the navigation, right-click – uninstall. as shown in Figure 2

Figure 2

3. Search program and function: cygwin, the result is empty. as shown in Figure 3

Figure 3

4. Find the previous installation package, D:\soft\setup-x86_64.exe. as shown in Figure 4

Figure 4

5. Select item 1 and install from Intemet (the downloaded file will be reserved for future use). If you have downloaded it before and have reservations, it is recommended to select item 3 and install it from the local directory. as shown in Figure 5

Figure 5

6. Select the previously installed directory of cygwin, the default is: c:\cygwin64, no need to change. as shown in Figure 6

Figure 6

7. Select the local package directory. Modified to: D:\soft\cygwin. as shown in Figure 7

Figure 7

8. Progress. This page shows the progress of the download or installation. Error: Internal Error: Gcrypt Library Error 1 Unsupported PK alg. as shown in Figure 8

8

9. Decide to download the latest version of the installation package: http://www.cygwin.com/setup-x86_64.exe . Then repeat the above steps again. The latest version of the installation package, no errors are reported again. Successfully entered the Select Packages interface. as shown in Figure 9

Figure 9

10. In the View drop-down list, select: Category, and then in the new column of the all row, select uninstall. Click Next. As shown in Figure 10

Figure 10

11. Uninstall is complete. as shown in Figure 11

Figure 11

12, but found the installation directory: C:\cygwin64 still exists. as shown in Figure 12

Figure 12

13. Decided to uninstall again. Uncheck Hide Obsoleete Packages. That is to display outdated packages. Repeat step 10. as shown in Figure 13

Figure 13

14. In the Resolving Dependencies page, uncheck Accept Default Problem Solutions. That is, the default problem solution is not accepted. Uninstall all. Figure 14

Figure 14

15. If it continues, some packages may not work properly. Are you sure you want to continue (not recommended)? OK. as shown in Figure 15

Figure 15

16. But I found that the installation directory: C:\cygwin64 still exists. Although the directory has been reduced. as shown in Figure 16

Figure 16

17. Create a new file: uninstall.bat, the content is as follows.

SET DIRECTORY_NAME="C:\cygwin64"
C:\Windows\System32\TakeOwn /f %directory_name% /r /d y
C:\Windows\System32\icacls %directory_name% /grant administrators:f /t
pause

18. After the operation is successful, it is found that the installation directory: C:\cygwin64 still exists. Not as expected. as shown in Figure 17

Figure 17

E:\develop\2020\0807 - Uninstall Cygwin>Set directory_name="c:\cygwin64" in Windows 10 64-bit"

E:\Develop\2020\0807 - Uninstall Cygwin>C:\Windows\System32\TakeOwn /f in Windows 10 64-bit "C:\cygwin64" /r /d y

Success: This file (or folder): "C:\cygwin64" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\cygwin-terminal.ico" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\cygwin.bat" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\cygwin.ico" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\dev" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc" is now all owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\home" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\lib" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\tmp" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\CygWin64\var" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\dev\fd" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\dev\mqueue" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\dev\shm" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\dev\stderr" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\dev\stdin" is now all owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\dev\stdout" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\bash_completion.d" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\fstab" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\fstab.d" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\hosts" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\mtab" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\networks" is now all owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\nsswitch.conf" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\pki" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\postinstall" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\preremove" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\profile.d" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\protocols" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\rebase.db.x86_64" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\services" is now all owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\setup" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\skel" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\pki\ca-trust" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\pki\ca-trust\source" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\pki\ca-trust\source\ca-bundle.legacy.crt" "Laptop-9s1inv5o\administrator" All.

Success: This file (or folder): "C:\cygwin64\etc\postinstall\000-cygwin-post-install.sh.done" is now by the user "Laptop-9s1inv5o\administrator" All.

Success: This file (or folder): "C:\cygwin64\etc\postinstall\base-files-mketc.sh.done" is now by the user "Laptop-9s1inv5o\administrator" All.

Success: This file (or folder): "C:\cygwin64\etc\postinstall\base-files-profile.sh.done" is now by the user "Laptop-9s1inv5o\administrator" All.

Success: This file (or folder): "C:\cygwin64\etc\postinstall\bash.sh.done" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\postinstall\ca-certificates.sh.done" is now by the user "Laptop-9s1inv5o\administrator" All.

Success: This file (or folder): "C:\cygwin64\etc\postinstall\coreutils.sh.done" is now by user "laptop-9s1inv5o\administrator" all.

Success: This file (or folder): "C:\cygwin64\etc\postinstall\man-db.sh.done" is now by user "laptop-9s1inv5o\administrator" all.

Success: This file (or folder): "C:\cygwin64\etc\postinstall\mintty.sh.done" is now by user "laptop-9s1inv5o\administrator" all.

Success: This file (or folder): "C:\cygwin64\etc\preremove\base-files.sh.done" is now by user "laptop-9s1inv5o\administrator" all.

Success: This file (or folder): "C:\cygwin64\etc\preremove\ca-certificates.sh.done" is now by the user "Laptop-9s1inv5o\administrator" All.

Success: This file (or folder): "C:\cygwin64\etc\preremove\coreutils.sh.done" is now by user "laptop-9s1inv5o\administrator" all.

Success: This file (or folder): "C:\cygwin64\etc\preremove\man-db.sh.done" is now by user "laptop-9s1inv5o\administrator" all.

Success: This file (or folder): "C:\cygwin64\etc\preremove\_autorebase.sh.done" is now by user "laptop-9s1inv5o\administrator" all.

Success: This file (or folder): "C:\cygwin64\etc\setup\installed.db" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\setup\setup.rc" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\etc\setup\timestamp" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\home\administrator" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\home\administrator\.bashrc" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\home\administrator\.bash_history" is now by user "laptop-9s1inv5o\administrator" all.

Success: This file (or folder): "C:\cygwin64\home\administrator\.bash_profile" is now by user "laptop-9s1inv5o\administrator" all.

Success: This file (or folder): "C:\cygwin64\home\administrator\.inputrc" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\home\administrator\.minttyrc" is now by user "laptop-9s1inv5o\administrator" all.

Success: This file (or folder): "C:\cygwin64\home\administrator\.profile" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\lib\groff" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\lib\groff\groff_opts_with_arg.txt" is now by the user "Laptop-9s1inv5o\administrator" all .

Success: This file (or folder): "C:\cygwin64\usr\local" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr\share" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr\src" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr\tmp" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr\local\bin" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr\local\etc" is now all owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr\local\lib" is now all owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr\share\doc" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr\share\info" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr\share\doc\man-db" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr\share\doc\xz" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr\share\doc\man-db\man-db-manual.txt" "Laptop-9s1inv5o\administrator" All.

Success: This file (or folder): "C:\cygwin64\usr\share\doc\xz\faq.txt" is now by user "laptop-9s1inv5o\administrator" all.

Success: This file (or folder): "C:\cygwin64\usr\share\info\.stamp" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\usr\share\info\dir" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\var\log" is now all owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\var\run" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\var\tmp" is now all owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\var\log\setup.log" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\var\log\setup.log.full" is now owned by the user "laptop-9s1inv5o\administrator".

Success: This file (or folder): "C:\cygwin64\var\run\utmp" is now owned by the user "laptop-9s1inv5o\administrator".

E:\develop\2020\0807 - Uninstall Cygwin>C:\Windows\System32\ICACLS "C:\Cygwin64" in Windows 10 64-bit /grant administrators:f /t
Processed files: C:\cygwin64
Processed files: C:\cygwin64\cygwin-terminal.ico
Processed files: C:\cygwin64\cygwin.bat
Processed files: C:\cygwin64\cygwin.ico
Processed files: C:\cygwin64\dev
Processed files: C:\cygwin64\etc
Processed files: C:\cygwin64\home
Processed files: C:\cygwin64\lib
Processed files: C:\cygwin64\tmp
Processed files: C:\cygwin64\usr
Processed files: C:\cygwin64\var
Processed files: C:\cygwin64\dev\fd
Processed files: C:\cygwin64\dev\mqueue
Processed files: C:\cygwin64\dev\shm
Processed files: C:\cygwin64\dev\stderr
Processed files: C:\cygwin64\dev\stdin
Processed files: C:\cygwin64\dev\stdout
Processed files: C:\cygwin64\etc\bash_completion.d
Processed files: C:\cygwin64\etc\fstab
Processed files: C:\cygwin64\etc\fstab.d
Processed files: C:\cygwin64\etc\hosts
Processed files: C:\cygwin64\etc\mtab
Processed files: C:\cygwin64\etc\networks
Processed files: C:\cygwin64\etc\nsswitch.conf
Processed files: C:\cygwin64\etc\pki
Processed files: C:\cygwin64\etc\postinstall
Processed files: C:\cygwin64\etc\preremove
Processed files: C:\cygwin64\etc\profile.d
Processed files: C:\cygwin64\etc\protocols
Processed files: C:\cygwin64\etc\rebase.db.x86_64
Processed files: C:\cygwin64\etc\services
Processed files: C:\cygwin64\etc\setup
Processed files: C:\cygwin64\etc\skel
Processed files: C:\cygwin64\etc\pki\ca-trust
Processed files: C:\cygwin64\etc\pki\ca-trust\source
Processed files: C:\cygwin64\etc\pki\ca-trust\source\ca-bundle.legacy.crt
Processed files: C:\cygwin64\etc\postinstall\000-cygwin-post-install.sh.done
Processed files: C:\cygwin64\etc\postinstall\base-files-mketc.sh.done
Processed files: C:\cygwin64\etc\postinstall\base-files-profile.sh.done
Processed files: C:\cygwin64\etc\postinstall\bash.sh.done
Processed files: C:\cygwin64\etc\postinstall\ca-certificates.sh.done
Processed files: c:\cygwin64\etc\postinstall\coreutils.sh.done
Processed files: C:\cygwin64\etc\postinstall\man-db.sh.done
Processed files: C:\cygwin64\etc\postinstall\mintty.sh.done
Processed files: c:\cygwin64\etc\preremove\base-files.sh.done
Processed files: c:\cygwin64\etc\preremove\ca-certificates.sh.done
Processed files: C:\cygwin64\etc\preremove\coreutils.sh.done
Processed files: C:\cygwin64\etc\preremove\man-db.sh.done
Processed files: c:\cygwin64\etc\preremove\_autorebase.sh.done
Processed files: C:\cygwin64\etc\setup\installed.db
Processed files: C:\cygwin64\etc\setup\setup.rc
Processed files: C:\cygwin64\etc\setup\timestamp
Processed files: C:\cygwin64\home\administrator
Processed files: C:\cygwin64\home\administrator\.bashrc
Processed files: C:\cygwin64\home\administrator\.bash_history
Processed files: C:\cygwin64\home\administrator\.bash_profile
Processed files: C:\cygwin64\home\administrator\.inputrc
Processed files: C:\cygwin64\home\administrator\.minttyrc
Processed files: C:\cygwin64\home\administrator\.profile
Processed files: C:\cygwin64\lib\groff
Processed files: C:\cygwin64\lib\groff\groff_opts_with_arg.txt
Processed files: C:\cygwin64\usr\local
Processed files: C:\cygwin64\usr\share
Processed files: C:\cygwin64\usr\src
Processed files: C:\cygwin64\usr\tmp
Processed files: C:\cygwin64\usr\local\bin
Processed files: C:\cygwin64\usr\local\etc
Processed files: C:\cygwin64\usr\local\lib
Processed files: C:\cygwin64\usr\share\doc
Processed files: C:\cygwin64\usr\share\info
Processed files: C:\cygwin64\usr\share\doc\man-db
Processed files: C:\cygwin64\usr\share\doc\xz
Processed files: C:\cygwin64\usr\share\doc\man-db\man-db-manual.txt
Processed files: C:\cygwin64\usr\share\doc\xz\faq.txt
Processed files: C:\cygwin64\usr\share\info\.stamp
Processed files: C:\cygwin64\usr\share\info\dir
Processed files: C:\cygwin64\var\log
Processed files: C:\cygwin64\var\run
Processed files: C:\cygwin64\var\tmp
Processed files: C:\cygwin64\var\log\setup.log
Processed files: C:\cygwin64\var\log\setup.log.full
Processed files: C:\cygwin64\var\run\utmp
82 files successfully processed; failed when processing 0 files

E:\develop\2020\0807 - Uninstall Cygwin>Pause in Windows 10 64-bit
Please press any key to continue. . .

19. Shift + Delete Forces to delete the installation directory: C:\cygwin64. Do this for all current projects. Yes. Completely deleted successfully. as shown in Figure 19

Figure 19

20. It still exists in the system menu: cygwin – cygwin64 terminal. As shown in Figure 20

Figure 20

21. Press Win + R to open the run, enter regedit, and press Enter to open the registry. HKEY_CURRENT_USER\Software\Cygwin. need to be deleted. as shown in Figure 21

Figure 21

22. It still exists in the system menu: cygwin – cygwin64 terminal. Right click – more – open file location. Figure 22

Figure 22

23. File: C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Cygwin\Cygwin64 Terminal. Delete the directory: C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Cygwin. Figure 23

Figure 23

24. It no longer exists in the system menu: cygwin – cygwin64 terminal. Figure 24

Figure 24

25. Find in the registry: cygwin, no result. So far, Cygwin has been completely uninstalled in Windows 10 64-bit. as shown in Figure 25

Figure 25