You can fix your permissions on your trusted.gpg and trusted.gpg.d files in /etc/apt, so that the files are world-readable (chmod ugo+r /etc/apt/trusted.gpg /etc/apt/trusted.gpg.d -R) [or give access to root and _apt via acls].
You don't have to do that, though - it will start "working" again in 1.2.17. "working" in the sense that unreadable files are ignored (or warned about, not sure yet).
You can fix your permissions on your trusted.gpg and trusted.gpg.d files in /etc/apt, so that the files are world-readable (chmod ugo+r /etc/apt/ trusted. gpg /etc/apt/ trusted. gpg.d -R) [or give access to root and _apt via acls].
You don't have to do that, though - it will start "working" again in 1.2.17. "working" in the sense that unreadable files are ignored (or warned about, not sure yet).