good morning Till,
I did not upgrade anything other than what the newest version of ISPConfig updated.
I rebooted the computer last night, and the overnight cron job did not report the same errors, so I am guessing that it needed a reboot, even though it did not say so?
anyway, here is the df -h as requested:
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 5.8G 4.0G 1.6G 73% /
/dev/sda6 140G 4.2G 136G 3% /home
Thanks for getting back to me.