I was upgrading Ubuntu 16 to 18. During the installation process it stopped at:
Setting up pepperflashplugin-nonfree (1.8.3+nmulubuntu1) ...
I know that flash is no longer supported but I'm in the middle of the installation. I waited for an hour but nothing has change.
Any ideas?
My idea is to be patient. The package system is not broken, it's just stalling since a maintainer script is trying over and over again to download the plugin from Adobe. It may take several hours before it gives up...
There is a dummy pepperflashplugin-nonfree package in xenial-proposed. It's a pity that it hadn't made it to xenial-updates before you started the version upgrade (see bug #1911463).
