$ sudo apt-get remove libarchive12 

Uninstall libarchive12 including dependent package

If you would like to remove libarchive12 and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove libarchive12 

Use Purging libarchive12

If you use with purge options to libarchive12 package all the configuration and dependent packages will be removed.

$ sudo apt-get purge libarchive12 

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 libarchive12 

See Also,