There is a common issue with cPanel when trying to force an update.

You might get an error message which looks like :

“fatal: Your RPM database appears unstable. It is not possible at the moment to install a simple RPM”

– RPM database gets corrupted over a while,  hence preventing cP from updating.

– Give in the following, to fix this issue :

# mkdir /root/old_rpm_dbs/
# mv /var/lib/rpm/__db* /root/old_rpm_dbs/
# rpm --rebuilddb ( rebuilds the RPM database )
# /scripts/upcp  ( cPanel update )