Server does not boot after lvreduce

[-jago-]

Hi, by typing df -hT, I realized two days ago that in one of my old servers the partition /dev/mapper/vg0-root was filled-up to 100% while the corresponding home was at some 70%. The server is a i7-2600K 16GB RAM, 1TB + 2TB HDDs, with the old LMDE distro.
I deleted some files in /usr, /var, and /tmp and I got some free space in the root partition (some MB out of 40 GB). Then I was googling and I read how to increase space for the root volume and shrink it for the home.
I'm some 500 km far from that computer so I worked on-line, no backup copies... The filesystem is ext4.
OK, following a number of answers on this issue I used the following commands, in this order:

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# lvextend -L +5G /dev/mapper/VG0-root 
# lvreduce -L -5G /dev/mapper/VG0-home 
# resize2fs /dev/mapper/VG0-root

The size of the root was increased as I needed, as shown with df -h. Then I tried

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# resize2fs /dev/mapper/VG0-home

and it gave me an error, I could not shrink it. I also realyzed that I should resize the filesystem first and only then use the lvreduce command for the logical volume.

My last action (so bad in the end!) was rebooting the system... now it does not boot and the server is unreachable in remote. At present I cannot provide outputs from lvs or gvs
My next move: I'll travel tomorrow to the place where the computer is and will try to boot into it with a Linux Mint distro from an USB drive. But I do not know if just reversing the lvreduce it will work.
I very much appreciate any help someone could give me on this.
The system is critical and I do need to recover it. Yes, at these moments one realizes how bad and dangerous is not doing backups