I installed an application called Wireshark, using:
sudo apt-get install wireshark
I searched it and launched it. Then, I tried to uninstall it using GUI. But it is not removing.
I tried using:
sudo apt-get remove wireshark
And the weird thing is that the application is still in the system!
sudo apt-get remove wireshark
? That should work. Also, a program will keep running after the package that it belongs to is removed; you just can't restart it after you close it. – Jos Sep 19 '16 at 20:33