Bug#919602: apache2: reload via systemd: apache2.service: Failed to set up mount namespacing: No such file or directory

[Jason Lingohr <jason@lucid.net.au>]

On Wed, 23 Oct 2019 16:31:39 +0200 Sven Bartscher wrote:
> Hi,
>
> do you use tools to age out files in /var/tmp or /tmp? I recently
> encountered this problem myself (on Jessie) and the cause was, that
> tmpreaper deleted the private tmp directories of the apache2.service
> unit. I didn't observe the apache2 service being stopped after receiving
> the error though, so you problem might actually be separate from mine.


I'm having the same issue on a fresh buster install, and don't have 
tmpreaper installed.  I only see systemd-tmpfiles-clean.service run a 
few hours before.