Uninstalling IntelliJ Idea from Ubuntu 18.04

It will depend on the version of IntelliJ Idea you have. IntelliJ suggests to use commands

umake -r ide idea

or

umake -r ide idea-ultimate

If you get the message

Command 'umake' not found, but can be installed with:

sudo snap install ubuntu-make # version master, or sudo apt install ubuntu-make

See 'snap info ubuntu-make' for additional versions.

and after installing and using the umake command again you obtain

ERROR: You can't remove Idea Ultimate as it isn't installed

you will have to proceed manually, (Remove the whole Idea directory where the bin/idea.sh file is) If you are not in the mood to install more stuff, this other command might work

sudo apt-get remove idea

you can find the name of your app by using this command

apt list --installed

If (like in my case) there is not any IntelliJ or Idea item on the installed-software list, you will have to proceed manually, (Remove the whole Idea directory where the bin/idea.sh file is)

There are other tutorials to remove Idea completely. After deleting the folder with IDE installation, remove IDE settings/caches directories, should be enough.

If you had installed Intellij-Idea using snap, than do the next:

1. sudo rm -fr ~/.IdeaIC*/config && sudo rm -fr ~/.IdeaIC*/system
   

2. sudo snap remove intellij-idea-community --purge or sudo snap remove intellij-idea-ultimate --purge

3. sudo find * / | grep snap | grep intellij-idea will show what you additionally could remove:

   $ sudo rm -fr /var/lib/snapd/sequence/intellij-idea-community.json
   

4. If you want to remove downloaded package of Idea, then also clear cache from root user: # rm -fr /var/lib/snapd/cache/*. sudo could not help.