Uninstall IntelliJ Ultimate edition version 12

First do whereis idea and it will tell you that you need to delete:

/opt/idea-IC-173.4548.28/ This is where I installed IntelliJ.
/usr/local/bin/idea Only if you chose to install "Launcher Script" during IntelliJ installation.

Also need to delete:

~/.IdeaIC2017.3 It's a folder named after IntelliJ's version.
$HOME/.local/share/applications/jetbrains-idea-ce.desktop Only if you chose to install a main menu shortcut during installation.
In some cases you can also find jetbrains-idea.desktop under /usr/share/applications/

To remove the product completely, do the following:

Delete the installation directory
Delete the "config" and "system" configuration directories. These contain IntelliJ IDEA's caches, configuration and plugins.

See http://devnet.jetbrains.net/docs/DOC-181 for the OS specific locations of these two directories.

That should be all you need.

If you happen to install the software using snap package manager, then it is as simple as

sudo snap remove intellij-idea-community

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