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.
#deb822
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Fix apt's 'Missing Signed-By' notice on Ubuntu
N: Missing Signed-By means apt trusts a repo through its global keyring. Find the entry, check the key with gpg, and give each source its own Signed-By.