$ sudo apt-get remove fish-dbg 

Uninstall fish-dbg including dependent package

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

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

Use Purging fish-dbg

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

$ sudo apt-get purge fish-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 fish-dbg 

See Also,