Hi All,

Looking for some help, I decided I wanted to update my system from 20.04 to 20.10 BETA so I started it and left it to it. In the mean time I had another terminal tab open doing "speedtest -cli --simple" I then closed this tab but its also closed the update process by accident!!!

So in the about menu now its listed as Groovy Gorilla but if I do an apt upgrade for example it comes back with errors

Code:
andrewjb@andrewjb:~$ sudo apt updateHit:1 http://archive.canonical.com/ubuntu groovy InRelease
Hit:2 http://security.ubuntu.com/ubuntu groovy-security InRelease        
Hit:3 http://archive.ubuntu.com/ubuntu groovy InRelease                  
Hit:4 http://archive.ubuntu.com/ubuntu groovy-updates InRelease
Get:5 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Hit:6 http://archive.ubuntu.com/ubuntu groovy-backports InRelease
Get:7 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Err:5 http://security.ubuntu.com/ubuntu bionic-security InRelease    
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
Err:7 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
Fetched 177 kB in 1s (273 kB/s)
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up-to-date.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://security.ubuntu.com/ubuntu bionic-security InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.ubuntu.com/ubuntu bionic-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
W: Some index files failed to download. They have been ignored, or old ones used instead.
If I try upgrade or distro upgrade it does nothing, I don't think the update has completed and reckon their is a lot of software/packages which haven't updated. Is there anyway to rescue this install?

Its a Dell XPS Ubuntu Edition, was only supposed to support LTS version but I've switched it to non-LTS since. I get notifications about Dell BIOS updates in the Ubuntu software centre etc so its a proper install.