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'"
Status in apt package in Ubuntu:
New
Bug description:
Apt can fail to verify a Release file which verifies just fine when
calling apt-key directly.
Please advise how i can supply further debug information to help fix
the underlying bug.
Expected:
apt-get should only report that a repository is not signed when no such
signature was found.
If a signature was in fact successfully acquired but not verified, apt-get
should report failure to verify instead.
apt-get should have a meaningful error message when calling apt-key fails.
Bonus:
Calling apt-key should not fail when the same thing works fine on command
line.
A reference to "Debug::Acquire::gpgv" should be in apt-secure(8)
documentation.
Observed:
# uname -a
Linux hostname 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:34:49 UTC 2016
i686 i686 i686 GNU/Linux
# chroot reproducable
$ uname -a
Linux hostname 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:34:49 UTC 2016
armv7l armv7l armv7l GNU/Linux
$ lsb_release -a 2>/dev/null
Distributor ID: Ubuntu
Description: Ubuntu 16.04 LTS
Release: 16.04
Codename: xenial
$ apt-get -o "Debug::Acquire::gpgv=true" update
Get:1 http://ports.ubuntu.com xenial-security InRelease [92.2 kB]
0% [1 InRelease gpgv 92.2 kB]igners
Preparing to exec: /usr/bin/apt-key --quiet --readonly verify --status-fd 3
/tmp/apt.sig.jYGUCG /tmp/apt.data.uTkX1c
gpgv exited with status 111
Summary:
Good:
Bad:
Worthless:
SoonWorthless:
NoPubKey:
Ign:1 http://ports.ubuntu.com xenial-security InRelease
Fetched 92.2 kB in 1s (79.5 kB/s)
Reading package lists... Done
W: GPG error: http://ports.ubuntu.com xenial-security InRelease: Could not
execute 'apt-key' to verify signature (is gnupg installed?)
W: The repository 'http://ports.ubuntu.com xenial-security InRelease' is not
signed.
N: Data from such a repository can't be authenticated and is therefore
potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration
details.
$ /usr/bin/apt-key --quiet --readonly verify --status-fd /dev/stderr
/tmp/apt.sig.jYGUCG /tmp/apt.data.uTkX1c
gpgv: Signature made Tue May 3 19:02:17 2016 UTC using DSA key ID 437D05B5
[GNUPG:] SIG_ID e53PXRjA/EMb7CuZJtAicvvUm60 2016-05-03 1462302137
[GNUPG:] GOODSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key
<ftpmas...@ubuntu.com>
gpgv: Good signature from "Ubuntu Archive Automatic Signing Key
<ftpmas...@ubuntu.com>"
[GNUPG:] VALIDSIG 630239CC130E1A7FD81A27B140976EAF437D05B5 2016-05-03
1462302137 0 4 0 17 10 01 630239CC130E1A7FD81A27B140976EAF437D05B5
gpgv: Signature made Tue May 3 19:02:17 2016 UTC using RSA key ID C0B21F32
[GNUPG:] SIG_ID kCsrLo9VUm7YcYhhqQUw2fbWoY4 2016-05-03 1462302137
[GNUPG:] GOODSIG 3B4FE6ACC0B21F32 Ubuntu Archive Automatic Signing Key (2012)
<ftpmas...@ubuntu.com>
gpgv: Good signature from "Ubuntu Archive Automatic Signing Key (2012)
<ftpmas...@ubuntu.com>"
[GNUPG:] VALIDSIG 790BC7277767219C42C86F933B4FE6ACC0B21F32 2016-05-03
1462302137 0 4 0 1 10 01 790BC7277767219C42C86F933B4FE6ACC0B21F32
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