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Sarah A. Morrigan14,329 Points
Removing software that was manually built
When I use apt-get or synaptic, uninstalling software is pretty self-explanatory (sudo apt-get remove...).
But I have a few programs I had installed manually in the past (I'm using Lubuntu 14.04 "trusty") and I've been wanting to clean up some clutter by uninstalling them.
Is there a good way to remove those?
And also: is it safe to delete files that were untarred (in this video's example, sqlite3 in the ~/src/sqlite3* directory) once the program was compiled?
It is usually safe to remove the source folder after the compilation & installation phases are complete.
Having them around helps with the uninstallation process (which relates to your first question). If you want to uninstall a manually installed software package just go to the source folder (where the Makefile script for that package is) and type the following at the command prompt:
sudo make clean uninstall
The clean target will delete the compilation artefacts in the local directory. The uninstall target should remove the binary package artefacts from where they were previously installed.
Note that not all package developers include an uninstall target in their Makefile script, so your results may vary depending on the actual package you are trying to install/uninstall.