***
The following packages will be upgraded:
python3
1 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
12 not fully installed or removed.
******
That it; clean your system first: its easy via synaptic.
Does not forget to always purge the removed packages to avoid old settings left behind, which can seriously disturb the system.
Your dialog comments says it all:
***
The following packages will be upgraded:
python3
1 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
12 not fully installed or removed.
******
That it; clean your system first: its easy via synaptic.
Does not forget to always purge the removed packages to avoid old settings left behind, which can seriously disturb the system.