Upgrade to 8.1 hangs: "waiting for transaction lock..."

[eugenevdm]

I've tried upgrading from 8.01 to 8.1 on FC4. It's hanging at the following stage:

Start packages installation
Install package psa-backup-manager-8.1.0-fc4.build81061226.14.i586, psa-migration-manager-8.1.0-fc4.build81061226.14.i586, psa-api-rpc-8.1.0-fc4.build81061226.14.noarch, psa-api-8.1.0-fc4.build81061226.14.noarch
warning: waiting for transaction lock on /var/lib/rpm/__db.000

Presumably it's having trouble accessing a database or something but what do I do to check this? I require urgent assistance!

 

[eugenevdm]

Apologies: I just had to wait a little longer!

The anxiety was killing me. Upgrade successfull!