This bites me as well.
I tried symlinking /usr/bin/apt-key to /bin/true but that also fails.
Strace shows:
24419 execve("/usr/bin/apt-key", ["/usr/bin/apt-key", "--quiet", "--readonly",
"verify", "--status-fd", "3", "/tmp/apt.sig.masxvS", "/tmp/apt.data.Orpf94"],
[/* 25 vars */]) = -1 EPERM (Operation not permitted)
24419 write(2, "Couldn't execute /usr/bin/apt-key to check
/var/lib/apt/lists/no.archive.ubuntu.com_ubuntu_dists_xenial_InRelease", 113) =
113
...
24418 write(2, "Sub-process apt-key returned an error code (111)", 48) = 48
24418 exit_group(111) = ?
...
24417 write(2, "gpgv exited with status 111\n", 28) = 28
So the finger pointing at gpgv seems to be in error.
Though running it with strace might change things as well.
Apparmor is running on the machine and is enforcing (as a default
setting, I did nothing specific to either enable or disable anything in
it, or even initiate installation or enforcement), but nothing is logged
about apt-key.
** Attachment added: "ubuntu-bug apt report"
https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1577926/+attachment/4710581/+files/apport.apt.l5bhmhue.apport
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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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