Warning on boot: unsafe permissions on tails-iuk homedir

In the bug reports log I see this line, which may require fixing in Tails, or gpg:

gpg: WARNING: unsafe permissions on homedir `/usr/share/tails-iuk/trusted_gnupg_homedir’

Here’s the relevant part of the log file:

Configuring Tails

- importing GnuPG key
gpg: keyring `/home/amnesia/.gnupg/secring.gpg’ created
gpg: keyring `/home/amnesia/.gnupg/pubring.gpg’ created
gpg: /home/amnesia/.gnupg/trustdb.gpg: trustdb created
gpg: key F0C43132: public key “Tails bug squad <tails-bugs@boum.org>” imported
gpg: key F93E735F: public key “Tails developers (Schleuder mailing-list) <tails@boum.org>” imported
gpg: key BE2CD9C1: public key “Tails developers (signing key) <tails@boum.org>” imported
gpg: Total number processed: 3
gpg: imported: 3 (RSA: 3)
gpg: no ultimately trusted keys found
- importing GnuPG signing key into tails-iuk’s trusted keyring
gpg: WARNING: unsafe permissions on homedir `/usr/share/tails-iuk/trusted_gnupg_homedir’

Feature Branch: bugfix/15318-update-sysadmins-key

Original created by @mercedes508 on 7037 (Redmine)