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When I tried to remove monodevelop, I got these errors:

root@So-so:~# sudo apt-get autoremove monodevelop
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package monodevelop is not installed, so not removed
0 upgraded, 0 newly installed, 0 to remove and 7 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up monodoc-browser (2.10-1) ...
generating monodoc index...
grep: /etc/gre.d/*.conf: No such file or directory

Unhandled Exception: System.TypeLoadException: A type load exception has occurred.
[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeLoadException: A type load exception has occurred.
dpkg: error processing monodoc-browser (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)

How can I fix this?

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Try typing sudo apt-get purge monodoc-browser first

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Firstly, you are using an invalid command to remove one package. To remove the monodevelop package, you should use apt-get remove monodevelop.

Secondly, you should attempt to purge monodoc-browser, which is trying to finish installing itself. Try using apt-get remove --purge monodoc-browser.

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