UPDATE:
Just freshly reinstalled OMV all over again. I am still not able to install the Plex Plugin
What I also noticed is that I can't install anything else.
For example: This is what I get when trying to install the autoshutdown-plugin:
Reading package lists...
Building dependency tree...
>>> *************** Error ***************
Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C; export DEBIAN_FRONTEND=noninteractive; apt-get --yes --force-yes --fix-missing --allow-unauthenticated --reinstall install openmediavault-autoshutdown 2>&1' with exit code '100': Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
bzip2 fping sysstat
Suggested packages:
bzip2-doc isag
The following NEW packages will be installed:
bzip2 fping openmediavault-autoshutdown sysstat
0 upgraded, 4 newly installed, 0 to remove and 66 not upgraded.
E: Could not get lock /var/cache/apt/archives/lock - open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/cache/apt/archives/
Any Idea what the issue could be ? Again: This is coming from a FRESH new OMV installation!