I have ubuntu 20.10, 64 bit.
In Menu, there are 2 instances of Okular.
I can use it but cannot remove via Terminal.
igor@igor-System-Product-Name:~$ sudo apt remove okular
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'okular' is not installed, so not removed
In the Software center, Okular is not marked as installed.
Please advise.