I'm upgrading Ubuntu on a new laptop , 16.04 to 18.04, following instructions here.
The last command I ran was:
sudo do-release-upgrade -d
Now I'm stuck on
To continue please press [ENTER]
Inhibiting until Ctrl+C is pressed...
I can't say exactly, but I started upgrading about three hours ago. It seems to me that the upgrade is taking too long. I also noticed that I have no network activity in System Monitor, and the Total Received number is less than the upgrade download size (which is 1 189 M).
Is this possible to check my upgrade status? May the System Monitor received size not taking into account any traffic?
I canceled the process and I saw that there's actually an error.
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
So I looked for the process that was blocking it
sudo lsof /var/lib/dpkg/lock
It happened to be aptd. I checked its pid
ps -e | grep aptd
and killed it
sudo kill -9 14806
After that I was able to run (as @Jos suggested):
sudo apt install -f
And started the upgrade process from the beginning.