I got asked for Ubuntu 20.04.
So if Xojo can’t load libwebkitgtk, it will switch to online help, which annoyed some users on Linux.
To fix this, you go here:
and you download those files:
libjavascriptcoregtk-3.0-0_2.4.11-3ubuntu3_amd64.deb
libwebkitgtk-3.0-0_2.4.11-3ubuntu3_amd64.deb
libicu60_60.2-3ubuntu3.1_amd64.deb
Then you install each via apt-get install, first the icu, then JavaScript and then libwebkitgtk:
sudo apt-get install libicu60_60.2-3ubuntu3.1_amd64.deb
sudo apt-get install libjavascriptcoregtk-3.0-0_2.4.11-3ubuntu3_amd64.deb
sudo apt-get install libwebkitgtk-3.0-0_2.4.11-3ubuntu3_amd64.deb
and then it works.