I've an Azure VM that has had quite a lot of extra work regards its networking etc performed as post-create setup. Having read about a particular vulnerability that the VM was susceptible to (judging by the kernel version) I decided to try upgrading the kernel. Perhaps it worked, perhaps not - at the moment the VM gets stuck while booting. The Boot Diagnostics blade of azure management portal shows a screenshot of the machine as a read-only diagnostic of what the screen looked like at the time of the shot (and an updated screenshot can be requested). It looks like this:
I'd like to find a way to recover the situation without deleting the entire VM and having to start over with the ancillary setup. If I could find a way to "press Enter" that would probably be easiest but I haven't yet found any way to do that and dismiss this bootloader screen.
I'm not averse to wiping the OS Disk and replacing it with an image of Ubuntu 20 (how it was supplied when creating it from athe Azure marketplace) but I haven't found an easy option to do this - I was hoping that either Redeploy or Reapply would perform it, but it seems not.
This failed VM does have another sibling machine that is the same in nearly all regards except it wasn't upgraded. I'm wondering if I can take a snapshot image this other VM somewhere in the Azure portal, and use that snapshot to create a workable disk for the failed VM..
So, my question is:
What can I do, with the limited interface of the azure portal, to get or reset this machine back to a working state so I can SSH into it so I can run the scripts that set it up for our production use ?
Update:
Azure provide a "serial console" that can be used to interact with the instance in most cases, but here it looks like this:
Typing into here seems to have no effect on the bootloader menu
