What can I do from the home assistant virtual machine

I have a HAOS installed on synology virtual machine manager.
It has been up and running for a couple of years now

but when it doesn’t work all I know how to do is to restart the virtual machine
when this machine is running I can click the connect button and it gives me a command line but it doesn’t seem to match all the CLI pages here.

What can I do here, and how do I get a linux cli?

I can type ha and get a bunch of text but I can’t even scroll up to get to read the top of it.

Type ? to find out how to use the HA CLI

Install the “Terminal and SSH” add-on from the Add-On store.

I can’t scroll and everything is incomplete. Eg
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atm I’m trying to work out why it is not starting after the synology update

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You could try ha supervisor repair.

All your error means is that supervisor hasn’t started yet. If you google the error message you will see lots of topics with a myriad of suggestions.