Welcome @ArneWeise.
Indeed, always best to take a snapshot first:)
Also, I’ve revised the doc again because:
# dpkg-query -f '${Package} ' -W "kaltura-*"
will also output packages that were previously installed and are now removed which is not desired. You could do:
# dpkg-query -f '${Package} ${Status}\n' -W "kaltura-*"|grep "install ok installed"|awk -F " " '{print $1}'|xargs
To only get INSTALLED kaltura packages but to be honest, it’s best to just use:
# aptitude dist-upgrade
since really, you also want to upgrade all the packages the Kaltura packages rely on, such as Apache, OpenSSL, PHP, etc. This is especially important from a security standpoint.