This still seems to exist in the current release of Xenial; setting the
sandbox user to root bypasses the problem, leaving it at the default
means any cron job that calls 'apt-get update' breaks, because gpgv
exits with error 2 (unexpected error), which leads to a failure of the
'apt-key' action being executed.
The difference, as far as I can tell thus far, seems to be in that the
'_apt' user cannot read the 'pubring.gpg' file that is being created in
a temporary directory, which means that gpgv cannot access it when it
runs;
==
[pid 10149] stat("/etc/apt/trusted.gpg", {st_mode=S_IFREG|0644, st_size=12255,
...}) = 0
[pid 10149] faccessat(AT_FDCWD, "/etc/apt/trusted.gpg", R_OK) = 0
[pid 10149] open("/tmp/tmp.OcaWlGuT32/pubring.gpg", O_WRONLY|O_CREAT|O_APPEND,
0666) = -1 EACCES (Permission denied)
[pid 10149] write(2, "/usr/bin/apt-key: 309: /usr/bin/"..., 41) = 41
[pid 10149] write(2, "cannot create /tmp/tmp.OcaWlGuT3"..., 64) = 64
==
This problem does not occur when root is the sandbox user, set via
'APT::Sandbox::User "root";' in '/etc/apt/apt.conf'. It's the only
setting present. Disable that setting and the problem returns, while
running the same thing interactively works without any issues.
I'm a bit stumped, at this point, pausing my investigation for now, but
logging it here in case someone else runs into this.
The warning we're seeing looks as follows;
==
W: An error occurred during the signature verification. The repository is not
updated and the previous index files will be used. GPG error:
https://apt-cache.domain.example/cache/us-east-1.ec2.archive.ubuntu.com/ubuntu
xenial InRelease: Unknown error executing apt-key
==
Using the HTTPS transport to a local cache, fresh Xenial install based
on the official AMI, on AWS.
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https://bugs.launchpad.net/bugs/1577926
Title:
apt-key works fine, yet apt fails with "Could not execute 'apt-key'"
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