$ sudo apt-get remove dahdi-linux 

Uninstall dahdi-linux including dependent package

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

$ sudo apt-get remove --auto-remove dahdi-linux 

Use Purging dahdi-linux

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

$ sudo apt-get purge dahdi-linux 

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 dahdi-linux 

See Also,