Can't get rid of a program

[FrenchPress]

@smlin

I deleted most of its folders hoping to be able to uninstall it that way

Hi and welcome to the forum

The correct way to remove application is issuing the following command in terminal:
sudo apt remove --purge package-name

Refer to the tutorial on this forum.

Common Terminal Commands

Update and Install Command to update your sources: sudo apt update Command to check for available upgrades: apt list -u Or: apt list --upgradable Command to upgrade available packages on your system: sudo apt upgrade Upgrade as long as existing file deletion is not necessary sudo apt dist-upgrade Upgrade even if existing file deletion is necessary sudo apt full-upgrade Installing a package using sudo apt install that is already installed will mark the package as manually…

Since you have deleted some folders this command may not work.
If that is the case, you have to reinstall application to remove it.