Decided to try out Linux Mint on one of the desktops which had Windows 10 installed. To minimize interference with the borrowed machine, we installed Linux on a separate 256 GB SSD. To connect the SSD, we disconnected the CD/DVD drive.
To boot into the install USB, F10 is the key we have to press on boot, which gives the option to go into System Settings or BIOS.
The machine was rebooting instead of shutting down when the 'Shut down' option was chosen.
https://askubuntu.com/questions/1321208/computer-reboots-instead-of-shutting-down
All Power > "Power on X" settings should be turned off in BIOS. I also found a setting which said, "When lose power" --> "go back to previous state". Changed that to 'shut down', too.
With these changes, the machine shuts down. But when power is removed and re-applied to the SMPS (by putting on the UPS the next day), the machine still automatically boots even without pressing the power button - so a separate switchable plug would be desirable.
Then, added swap to prevent sudden freezes due to memory issues (though system freezes due to insufficient power is still possible, the SMPS is underpowered) -
https://thelinuxcode.com/add-swap-space-linux-mint/
free -h
sudo fallocate -l 32G /swapfile
sudo mkswap /swapfile
sudo chmod 0600 /swapfile
sudo swapon /swapfile
free -h
Edit: The above method of adding a swap file does not persist on rebooting - apparently it will persist only if added to /etc/fstab - so I added a line to root cron -
sudo crontab -e
#(at the bottom of the file)
# all other cron jobs must be above this
@reboot swapon /swapfile
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