oh… btw (in case it matters)… this what Ubuntu’s “Disks” shows about my Samsung SSD:
but please don’t ask me wth is that “107GB Block Device” 
Late reply. The tinkering spirit in me made me install UEFI boot and use ARC via Tailscale. All seems to be working fine. How safe is Tailscale? should I worry at all? I’ve signed up to Tailscale via my Apple account.
Tailscale is safe but I would also create a passkey for Tailscale in case you lose access to your Apple account. I used to use Microsoft to log in to Tailscale but when I moved my email across to a different email provider I also lost the authentication needed to log in to Tailscale. A passkey would have prevented this issue.
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Why not simply create a new, separate Gmail (or similar) email account that you use purely for Tailscale? That way it wont be a problem if you change your actual email account name or provider.
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Easy to do but I hadn’t realised the problem before I created my initial Tailscale.