Thank you Jakube!
I am also not sure how did it happen, but after your recommendations it's working properly now.
Have a good day!

On Wed, 24 Jul 2019 at 22:03, Jakub Skokan <jakub.skokan@vpsfree.cz> wrote:
Hi,

On 7/24/19 9:41 AM, Panagiotis Palias wrote:
> after recent upgrade to Debian Buster, pihole stopped working and from
> the output of diagnostics `pihole -d` I can see the error:
> *** [ DIAGNOSING ]: contents of /dev/shm
> /dev/shm does not exist.
> ls: cannot access '/dev/shm': Too many levels of symbolic links
>
> Which is because of that:
> trendy@vps:[~]$ls -la /dev/shm
> lrwxrwxrwx 1 root root 8 Ιουν 29 04:49 /dev/shm -> /run/shm
> trendy@vps:[~]$ls -la /run/shm
> lrwxrwxrwx 1 root root 8 Ιουλ 21 11:18 /run/shm -> /dev/shm
>
> I believe this is not normal; does anyone know where they should point to?

No idea what happened here, but when I look at /dev/shm on a newly
created VPS, it's mounted as tmpfs. /run/shm is a symlink to /dev/shm
just like on your VPS. So here's what you could try:

   rm /dev/shm
   mkdir /dev/shm
   reboot

Jakub
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--
-p