Getting the following message: Error authenticating some packages This is the list of packages: acroread acroread-common adobe-flash-properties-gtk adobe-flashplugin
I had the same error, and had to manually remove these packages
After this, I was able to complete the upgrade:
Once your system is upgraded, you can worry about getting flash working again, which shouldn't be too hard.
Hi, you have to install the packages manually.
sudo apt-get install namepackage
In the list of the packages you have the names!