<html><head></head><body><div>Grub, Grub2, or your UEFI BIOS (if you have one) can all provide a menu for what to boot.</div><div><br></div><div>I hear your pain. I am currently running Debian-based Ubuntu 16.04.5 LTS on a Dell XPS 15 9650 4K LCD with a Dell TB16 dock - all is fully functional except dimming the external 34" or 40" 4K dock attached monitor. It took me a bit to get this all working and Ubuntu 18.04.1 LTS replaced Unity with Gnome 3 which also removed franctional scaling of the display(s) - only providing for 100% or 200%, and I currently run at 150% or 162%. Gnome 3 also screws up my virtual workspace preferences and talk on the forums is that this hardware combination is borked on 18.04.1, so I'm right there with you.</div><div><br></div><div>I will make a dd replica of my 16.04.5 SDD onto one or more external SDDs and play with upgrading them in place. Grub2 should automatically add the new external SDD to the boot menu.</div><div><br></div><div>On my Ubuntu desktop workstation, I have space and some open SATA ports that I can simply plug a fresh SDD into and do a fresh install. I would let Grub2 update the MBR of the existing bootable partition.</div><div><br></div><div>I have had little to no issues with Grub or Grub2, so I continue to use that for my boot menu and boot options.</div><div><br></div><div>It sounds like you have split a single HDD/SDD into multiple partitions for your different OS versions. Do you have the ability to have separate disks for each OS version? That shouldn't be needed, but one never knows. I always use separate disks when I do these things.</div><div><br></div><div><br></div><div>On Fri, 2018-09-14 at 06:54 -0500, o1bigtenor wrote:</div><blockquote type="cite"><pre>Greetings
I have had it working before but I can't seem to get things right this time.
I want to have two different copies of debian on one box with the
choice of which when I boot in.
Wanting to have available both debian stable (9.5 at present) and
debian testing (10). This is so I can experiment with software - - -
adding it and if huge errors result or are caused - - - no real biggie
because its not a main working box (like the server or my main
computer). Doing this because I really have gotten to hate having a
main box down for even a few days because software that I loaded and
installed caused me to bork the system (I've done this more than a few
times!!! grin - - -but 'learning' isn't always a barrel of fun!!)
So I've installed both of these systems (more than once each) they
have their own partitions for everything but boot and efi yet I'm only
seeing one system available on grub (depending upon the last install
as to which). So I'm doing something wrong!! I tried using grub
updating tools (# os-prober) still no joy. The web pages that I'm
finding seem to be for an older version of grub and, as usual, I'm
finding man pages are like reading cuneiform (which I find
unintelligible).
This is likely something quite simple but I'm just not seeing it - - -
please - - - some ideas/pointers?
TIA
Dee
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