$ sudo apt-get remove fcitx-dbg 

Uninstall fcitx-dbg including dependent package

If you would like to remove fcitx-dbg and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove fcitx-dbg 

Use Purging fcitx-dbg

If you use with purge options to fcitx-dbg package all the configuration and dependent packages will be removed.

$ sudo apt-get purge fcitx-dbg 

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove fcitx-dbg 

See Also,