Uninstalling Plasma desktop

I'm using ubuntu 16.04 LTS and installed plasma desktop using the following command:

sudo apt-get install plasma-desktop

But later I uninstalled it using these commands:

sudo apt-get purge plasma-desktop
sudo apt-get autoremove

After restarting my system, the login screen still gives me an option to choose Ubuntu(default) or Plasma. I want to remove plasma completely.

Solution 1:

Uninstalling packages that are installed as dependencies of a metapackage is often harder. Because, autoremove doesn't remove the packages pulled by a metapackage - See this question for an explanation of why Why removing gnome-core does not remove all of it's dependencies?

However, removing this curated list of packages will get rid of plasma desktop mostly, if not completely.

sudo apt --purge autoremove plasma-desktop-data plasma-workspace kded5 libkf5plasma5 libkf5runner5 kactivities

It should not remove other KDE5 applications (as far I can check), but it does remove, you need to install that package later manually.

Solution 2:

I'd also like to add on Anwar's answer by saying, also run sudo apt purge kwalletmanager.

It's a program that showed up after I installed KDE Plasma, if you do not need it you can uninstall it.