I tried to install a deb package with Gdebi, Ubuntu software was running at the time, but it didn't show any warning and started installing, then it got stuck without any progress and eventually I had to shut down the PC, so I killed the process mid installation.
After that, when I try to install the package again the following comes out:
Only one software management tool is allowed to run at the same time. Please close the other application (e.g. Update Manager, aptitude, or synaptic) first.
This persists even after a reboot, so I don't know what management software could possibly be going. I tried using Ubuntu software to install a program and it was able, so it must be a problem with Gdebi.
Using Ubuntu 20.04.3 LTS.
Anybody knows what might be happening?
Thanks for your time.
Edit:
Output of suod apt-get update:
Hit:2 http://ppa.launchpad.net/lutris-team/lutris/ubuntu focal InRelease
Get:3 http://es.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:4 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Get:5 http://es.archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]
Get:6 http://es.archive.ubuntu.com/ubuntu focal-updates/main amd64 DEP-11 Metadata [283 kB]
Get:7 http://es.archive.ubuntu.com/ubuntu focal-updates/universe amd64 DEP-11 Metadata [361 kB]
Get:8 http://es.archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 DEP-11 Metadata [940 B]
Get:9 http://es.archive.ubuntu.com/ubuntu focal-backports/universe amd64 DEP-11 Metadata [10,4 kB]
Get:10 http://security.ubuntu.com/ubuntu focal-security/main amd64 DEP-11 Metadata [29,0 kB]
Get:11 http://security.ubuntu.com/ubuntu focal-security/universe amd64 DEP-11 Metadata [62,5 kB]
Get:12 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 DEP-11 Metadata [2.464 B]
Fetched 1.078 kB in 1s (860 kB/s)
Reading package lists... Done
```