Comment 33 for bug 1791542

I cannot get my apt system to work again. I tried adding the bionic-proposed repository as indicated in the link (above), but when I try the 'sudo apt --fix-broken install', it still wants to install the broken libgles1 and libglvnd-dev packages, which fail (as before).

Please, could someone provide step by step command line instructions on how to get a working apt system again.