Roberto C. Sánchez <robe...@debian.org> writes: >On Tue, Mar 06, 2018 at 07:35:37PM +0000, John wrote: >> I am still looking for a clean way to upgrade my Debian box. >> >> Background is that the m/c is the interface to the world from the LAN, >> runs headless, and is fairly difficult to access physically. My >> attempt to upgrade from Whezzy to Jessie broke as it would not >> run/load the 3.16.0-4-amd64 kernel, and after a painful period I >> managed to get Jessie running with the Whezzy 3.2.0-4-amd64 kernel. I >> have uploaded the 3.16.0-5-amd64. What I would like would be to try a >> boot into the new kernel, but if that fails for the next and >> subsequent boots to be to the (working) Whezzy kernel. I think I >> heard once that there was such a mechanism but have not found it. >> BTW it is running grub. >> >grub-reboot (8) - set the default boot entry for GRUB, for the next >boot only > >Regards, > >-Roberto A caveat - if your boot directory is in a raid parition grub will not reset the boot environment - it knows how to read but not write raid partitions.
If you boot successfully you can reset it yourself - but if the boot fails you will be stuck.
