I should change to manual install that way you can send the actual terminal trace in the event of trouble.
You might have a permissions issues … eosinstaller is using platform-tools “in the background” … you could try the advice under Ubuntu Linux here:
That is two things
plugdevgroup- android-sdk-platform-tools-common (or similar name) to get
udev rulesstarted.
However, only “common” … system installed platform-tools might interfere.
The Requirements section of the manual install page shows the way to proceed for that method. I would avoid flip-flop between the two methods.