Thanks,
I'll try that as well.
I actually have a few disks and do installs when I am in a good mood, usually every other day.
That error message I get is maybe because author wrote: sudo apt-get install libssl1.0-dev,
apt-get instead of: apt, so something ain't on record.
Whatever, number of people working on Linux is thousends times of those working in Microsoft
so I'm not surprised with every day's new mess with Linux.
Just have a look at number of distros, imagine it all worked right... wrong.
https://distrowatch.com/table.php