Hi jsha,
thanks for the rather fast reply.
it’s a virtul server with 2GB of “physical” memory available and only a few things running on it. (apache, dovecot and exim4 basically). No, it is unlikely to be a memory issue in my case.
But… I’ve found the issue… an unresolved dependency…
Since this smelt like something generic I simply applied the following command again (which I found in another thread):
sudo apt-get install build-essential libssl-dev libffi-dev python-dev
and was surprised to see a number of packages being installed.
I executed the client once more and TATAA the fault disappeared.
Not sure what went wrong between the first execution and the second one month later.
I remember that letsencrypt-auto was executing apt-get on its own at first execution - is something missing in this list, may be?
Best regards,
Klaus