Almost everyone who runs an nostr:npub1aghreq2dpz3h3799hrawev5gf5zc2kt4ch9ykhp9utt0jd3gdu2qtlmhct node logs in with the user account:

umbrel@umbrel

But since nostr:npub1hxfkcs9gvtm49702rmwn2aeuvhkd2w6f0svm4sl84g8glhzx5u9srk5p6t runs on Ubuntu Server, the user account is:

node@strich

I just wanted to share that because it makes me smile every time.