$ sudo apt-get remove altree 

Uninstall altree including dependent package

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

$ sudo apt-get remove --auto-remove altree 

Use Purging altree

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

$ sudo apt-get purge altree 

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 altree 

See Also,