I did try to install openhab and by mistake I run a script that had added armf repositories to my Linux x86 machine.
Now every time I do apt update I have a bunch of errors plus I can see the Ign (ignored) for arm packages being listed.
For making things easy for users, I have taken care to clearly mention how to remove my PPA from their RPi’s sources, when I posted installation of packages from my PPA
The discussion here was “How to remove a PPA”, so even though this discussion is 8 months old, this how-to is still valid and relates to removal of any PPA, new or old.