Fix Tailscale install errors on Ubuntu
Most Tailscale install errors on Ubuntu are apt errors. Read the status code apt printed, then fix the release codename or the signing keyring.
#troubleshooting
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Fix duplicate apt sources and deb822 files
apt update says a target is configured multiple times. Find the legacy .list and deb822 .sources pair, keep one, and get a clean update run back.
Fix SSH Permission denied (publickey)
Permission denied (publickey) is five different faults. Read the ssh -v output, find which one you have, and fix it without locking yourself out.
Fix DNS over WireGuard: three failure modes
Your WireGuard tunnel is up but names do not resolve, or the queries leak to the local router. Find which of the three DNS failures you have, and fix it.