How to change SmartGit's licensing option after 30 days of commercial use on ubuntu?

I went on the internet and I found this:

To alter the license. First, go to

Windows: %APPDATA%\syntevo\SmartGit<main-smartgit-version>

Windows portable: SmartGit\.settings\preferences.yml

OS X: ~/Library/Preferences/SmartGit/<main-smartgit-version>

Unix/Linux: ~/.smartgit/<main-smartgit-version>

and remove the file settings.xml.

If you have updated many times, you may need to remove the updates folder as well.

It helped me on Windows, hope it helps you on other systems as well.

Starting from version 19.1 they have renamed filenames:

➜ SmartGit grep -rl 'listx' ./19.1
./19.1/preferences.yml
./19.1/.backup/preferences.yml

It is possible to delete them to reset the license setting.

I use linux and the answers did not help me.
I had to erase the folder ~/.config/smartgit to make it work again. This is what the documentation is saying

Default Location of SmartGit's Settings Directory
Windows %APPDATA%\syntevo\SmartGit\ (%APPDATA% is the path defined in the environment variable APPDATA)
Mac OS ~/Library/Preferences/SmartGit/ (the Finder might not show the ~/Libraries directory by default, but you can invoke open ~/Library from a terminal)
Linux/Unix ${XDG_CONFIG_HOME}/smartgit/ (if the environment variable XDG_CONFIG_HOME is not defined, ~/.config is used instead)