Additional Software: ensure APT is not broken after being interrupted
If APT is interrupted at the wrong time, it'll leave files owned by root:root in its "partial" directories. And then next time one uses APT, it'll notice it cannot overwrite those files as its default download user (_apt), and will thus try to download as root. Except our firewall prevents root from connecting to the Tor SOCKS proxy that APT is configured to use, so APT is stuck.
refs #18657 (closed)
Closes #18657 (closed)