$ sudo apt-get remove libtwofish0 

Uninstall libtwofish0 including dependent package

If you would like to remove libtwofish0 and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove libtwofish0 

Use Purging libtwofish0

If you use with purge options to libtwofish0 package all the configuration and dependent packages will be removed.

$ sudo apt-get purge libtwofish0 

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 libtwofish0 

See Also,