OMV5 web ui showed updates were available. Selected all and clicked install. This ended with error repeating for a long time.
Went to cli and did apt install -f.
root@omv5:~# apt install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up grub-pc (2.02+dfsg1-20+deb10u3) ...
Installing for i386-pc platform.
grub-install: warning: this GPT partition label contains no BIOS Boot Partition; embedding won't be possible.
grub-install: error: embedding is not possible, but this is required for cross-disk install.
Installing for i386-pc platform.
grub-install: warning: this GPT partition label contains no BIOS Boot Partition; embedding won't be possible.
grub-install: error: embedding is not possible, but this is required for cross-disk install.
Installing for i386-pc platform.
Installation finished. No error reported.
I think the grub update wants an interactive shell.
Anyway all is well and rebooting worked ok.
FYI