[Solved] Installation Failed, Package Manager error

Try the instructions in the following link:

Log files and bug reports

You can actually help us improve the installer by sending us your log file when you encounter a problem during installation. Calamares makes a log file by default and you can retrieve it by copy-paste the following in the terminal:

xed /home/liveuser/endeavour-install.log

Or Pastebin it and show the URL in the forum:

cat /home/liveuser/endeavour-install.log | eos-sendlogs

This will upload the log to ix.io and create a short URL to the log file.

You could use the eos-sendlog tool and post the URL you will get.