> File "/tmp/update-manager-K3_3vM/DistUpgrade/DistUpgradeView.py", line 374, in confirmChanges
> apt_pkg.size_to_str(downloadSize)
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 1: ordinal not in range(128)
I ran into precisely the same problem as in your second case after running 'sudo upgrade-manager -d'.
I then tried 'sudo do-release-upgrade -d' and the upgrade was successful.
> File "/tmp/update- manager- K3_3vM/ DistUpgrade/ DistUpgradeView .py", line 374, in confirmChanges size_to_ str(downloadSiz e)
> apt_pkg.
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 1: ordinal not in range(128)
I ran into precisely the same problem as in your second case after running 'sudo upgrade-manager -d'.
I then tried 'sudo do-release-upgrade -d' and the upgrade was successful.