debsums is a useful utility to validate packages in a ubuntu or debian system.


sudo debsums -c

If this identifies any problems you can fix them using.:

sudo apt install --reinstall <package name>

If debsums idenfifies several packages with issues, to fix all of them use:

sudo apt install --reinstall $(dpkg -S $(debsums -c) | cut -d : -f 1 | sort -u)

For more information there is a useful post about debsums on askubuntu

Upgrade to 20.04



If 20.04.1 is still not released when you run this command, then you can upgrade using do-release-upgrade -d.


Just so you remember, an additional SSH daemon will be started at port ‘1022’.

  • Select the recommended option for the LXD snap track i.e. version 4.0

This message was displayed at the end of the upgrade:


I clicked Yes to continue, and all was well.

Postgres Upgrade Cluster

To move the data from Postgres 10 to 12, run the following as root:

# list the clusters

# drop the new (empty) cluster
pg_dropcluster 12 main --stop
# migrate the data from 10 to 12
pg_upgradecluster 10 main

# remove the 10 cluster
pg_dropcluster 10 main --stop

# remove the old database engine
apt remove postgresql-10

# list the clusters
Ver Cluster Port Status Owner    Data directory              Log file
10  main    5432 online postgres /var/lib/postgresql/10/main /var/log/postgresql/postgresql-10-main.log

For more information, see Postgres Upgrade Cluster

Obsolete major version 10

The PostgreSQL version 10 is obsolete, but the server or client packages are still installed. Please install the latest packages (postgresql-12 and postgresql-client-12) and upgrade the existing clusters with pg_upgradecluster

Please be aware that the installation of postgresql-12 will automatically create a default cluster 12/main. If you want to upgrade the 10/main cluster, you need to remove the already existing 12 cluster (pg_dropcluster –stop 12 main, see manpage for details).

The old server and client packages are no longer supported. After the existing clusters are upgraded, the postgresql-10 and postgresql-client-10 packages should be removed.

Please see /usr/share/doc/postgresql-common/README.Debian.gz for details.