I have the following issue: I have a small server (Debian based) to which I can connect remotely (VPN/SSH connection). Now I want to change some boot options (in fact I want to migrate my root file system to another partition) and therefore I have to reboot my system.
In fact I am afraid of the possibility that something goes horribly wrong and neither SSH nor VPN can start up. In this scenario, I had to go the server personally which is located quite far away. I could ask someone to restart (in case of kernel panic,...) but there is nobody qualified to repair the system. Thus my question:
Is there a possibility to make a entry in the GRUB2 configuration that makes an entry the default only for the very next boot? So if there is a problem I can just reboot and recover with the old system? If the boot runs through without problems (which I would hope for) I could alter grub such that it boots by default from the new system.