I am using Ubuntu 21.10 and wanted to take my Pc to a relatives house.

I disconnected everything, reconnected everything, booted the machine and the result was:

/dev/nvme1n1p5: recovering journal
/dev/nvme1n1p5: clean, 329326/2321984 files, 4530131/9277440 blocks
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grub goes no further.

Selecting Windows 10 from grub boots Windows without problems.

I was thinking I would upgrade to the latest LTS version but read that it does not (maybe fixed) recognise the dual boot windows.

My /home is on a separate partition as are my data files.

Can anyone assist to get back into Ubuntu or advise whether I should take this opportunity and use the new LTS?

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(post deleted).

Did you try one of the grub menu entries in advance option?
At the grub menu entry, press e for edit add to the end of the line that begins with linux:
noresume

Before you disconnected the computer did you completely shutdown Ubuntu or was it just sleeping?

I would boot up into recovery mode or boot from a Ubuntu live USB and run fsck against all of your partition/filesystems to check for errors.

Your grub is working fine, the error you posted was from the kernel recovering the filesystem journal, which is normal for an improper shutdown. As to why the kenrnel stops there we would need more info.

Ubuntu includes a handy recovery mode in grub in the Advanced menu. Boot from that and it will give you some recovery options.

I tried your suggestion by adding noresume at the end of the line which started with linux /boot etc and ended with $svt_handoff after leaving a space.

I rebooted and the result was the same, grub just stopped

I remembered that when I restarted the machine after reconnecting everything that I found the keyboard was not lit and saw that the cable was not correctly connected the the usbc port.

I looked at the first recovery option and tried some of the things listed but one gave Download errors another completed but when I dropped to root I was lost.

Then I would run live USB version.

I disconnected the computer after it had been turned off/shutdown via the system overnight.

I used fsck from recovery mode and it suggested there were 9 obsolete file which should be removed. Other than removing those it did nothing to assist.

I ran a live USB but it was version 20.04 to see if I remembered how to chroot into the system to backup /home. Would it help if I had used 21.10?

You don't have to chroot. Your just running a fsck and the filesystems shouldn't be mounted. Did you run fsck on your home and data partitions?

I know I don't need to chroot to fsck, as I said, I ran fsck from advanced grub options but it did not help. I was looking considering chroot to backup /home should I have to install Ubuntu, either reinstall 21.10 or the new LTS.

What info would be needed to assist me?

I did not see any option in the list of options to choose on which partitions to fsck. It just gave a 'run fsck' option and I assumed that was the whole system.

I don't know, it has been awhile since I've played with recovery mode. I would manually check home and data.