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Getting the following message: Error authenticating some packages This is the list of packages: acroread acroread-common adobe-flash-properties-gtk adobe-flashplugin

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I had the same error, and had to manually remove these packages

sudo apt-get remove adobe-flash-properties-gtk adobe-flashplugin

After this, I was able to complete the upgrade:

sudo do-release-upgrade

Once your system is upgraded, you can worry about getting flash working again, which shouldn't be too hard.

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Hi, you have to install the packages manually.

sudo apt-get install namepackage

In the list of the packages you have the names!

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