I got the same issue apparently...
The ssh works and the VNC as well but nginx is non-updatable... and I cant find a way to get OMV web gui back to work any help would be helpful...
I tried
$ sudo apt install --reinstall --install-recommends nginx
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 88.5 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://ftp.igh.cnrs.fr/pub/os/linux/raspbian/raspbian buster/main armhf nginx all 1.14.2-2+deb10u4 [88.5 kB]
Fetched 88.5 kB in 1s (153 kB/s)
(Reading database ... 133910 files and directories currently installed.)
Preparing to unpack .../nginx_1.14.2-2+deb10u4_all.deb ...
Unpacking nginx (1.14.2-2+deb10u4) over (1.14.2-2+deb10u4) ...
Setting up nginx-full (1.14.2-2+deb10u4) ...
Job for nginx.service failed because the control process exited with error code.
See "systemctl status nginx.service" and "journalctl -xe" for details.
invoke-rc.d: initscript nginx, action "start" failed.
● nginx.service - A high performance web server and a reverse proxy server
Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Sun 2021-06-27 12:33:39 CEST; 30ms ago
Docs: man:nginx(8)
Process: 18328 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=1/FAILURE)
Jun 27 12:33:39 Minerva systemd[1]: Starting A high performance web server and a reverse proxy server...
Jun 27 12:33:39 Minerva nginx[18328]: nginx: [alert] could not open error log file: open() "/var/log/nginx/error.log" failed (2: No such file or directory)
Jun 27 12:33:39 Minerva nginx[18328]: 2021/06/27 12:33:39 [emerg] 18328#18328: open() "/var/log/nginx/access.log" failed (2: No such file or directory)
Jun 27 12:33:39 Minerva nginx[18328]: nginx: configuration file /etc/nginx/nginx.conf test failed
Jun 27 12:33:39 Minerva systemd[1]: nginx.service: Control process exited, code=exited, status=1/FAILURE
Jun 27 12:33:39 Minerva systemd[1]: nginx.service: Failed with result 'exit-code'.
Jun 27 12:33:39 Minerva systemd[1]: Failed to start A high performance web server and a reverse proxy server.
dpkg: error processing package nginx-full (--configure):
installed nginx-full package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of nginx:
nginx depends on nginx-full (<< 1.14.2-2+deb10u4.1~) | nginx-light (<< 1.14.2-2+deb10u4.1~) | nginx-extras (<< 1.14.2-2+deb10u4.1~); however:
Package nginx-full is not configured yet.
Package nginx-light is not installed.
Package nginx-extras is not installed.
nginx depends on nginx-full (>= 1.14.2-2+deb10u4) | nginx-light (>= 1.14.2-2+deb10u4) | nginx-extras (>= 1.14.2-2+deb10u4); however:
Package nginx-full is not configured yet.
Package nginx-light is not installed.
Package nginx-extras is not installed.
dpkg: error processing package nginx (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
nginx-full
nginx
E: Sub-process /usr/bin/dpkg returned an error code (1)
No success. I thought it was because I had clone my original SD card but can't find a link between cloning and the upodating...