$ sudo apt-get remove libtet1.5 

Uninstall libtet1.5 including dependent package

If you would like to remove libtet1.5 and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove libtet1.5 

Use Purging libtet1.5

If you use with purge options to libtet1.5 package all the configuration and dependent packages will be removed.

$ sudo apt-get purge libtet1.5 

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 libtet1.5 

See Also,