Grub2 problem - can only boot to 2 of 3 OS's

[Gary J. Kirkpatrick]

On Fri, May 29, 2020 at 4:48 AM jim <jf_byrnes at comcast.net> wrote:

> I had a system with Mint18.3 and Ubuntu18 installed. I had 100GB of free
> space at the end of the disk. I decided I wanted to install mint19.3 in
> the free space. I booted from the Mint19.3 install dvd. I used gparted
> to shrink the Ubuntu partition so I ended up with about 195GB of free
> space. I then had gparted create a new partition in the free space and
> installed Mint19.3.
>
> This is my configuration:
>
> Partition 1 = sda1 - Ubuntu18
>
> Partition 2 (extended) = sda6 - Mint18.3
>                           sda5 - swap
>
> Partition 3 = sda3 - Mint19.3
>
> When the Mint19 install rebooted the first time I noticed the grub menu
> was visually much larger looking than I normally saw under Mint18.3 but
> I didn't think much of it. When I was done working with Mint19.3 I
> restarted the system when the overly large grub menu cam up the only
> options were Mint19.3 & Ubutu18, Mint18.3 was not shown.
>
> I booted to Ubuntu and did some googling and read the solution was to
> run sudo update-grub2. I ran it. As the output scrolled by I did see
> Mint18.3, but when I rebooted Mint18.3 still was not an option. I booted
> to Mint19.3  and ran the sudo update-grub2 command but still Mint18.3 is
> not an option in the grub menu.
>
> It's been a while since I have installed a fresh OS so what do I need to
> do to get Mint18.3 to show up in grub. I upgraded Ubuntu16 to 18 so grub
> was not involved there.
>
> Thanks, Jim
>
>
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I had problems with GRUB, switched to rEFind boot manager.  Is doing the
job, although every once in a while Ihave to change the boot order in bios
http://www.rodsbooks.com/refind/

Garyk
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