[Users] Compatibility problems with latest APT

[Narcis Garcia]

Seems that download.openvz.org/debian keys are obsolete for current APT
tools versions:

$ sudo apt-get update
Ign:1 http://debian.grn.cat/debian stretch InRelease
Ign:2 http://repos.actiu.net/libre stretch InRelease

Hit:3 http://security.debian.org/debian-security stretch/updates
InRelease
Hit:4 http://debian.grn.cat/debian stretch-updates InRelease

Hit:5 http://repos.actiu.net/libre stretch Release

Hit:6 http://debian.grn.cat/debian stretch-backports InRelease
Ign:7 http://download.openvz.org/debian wheezy InRelease
Hit:8 http://debian.grn.cat/debian stretch Release
Hit:10 http://download.openvz.org/debian wheezy Release

Get:12 http://download.openvz.org/debian wheezy Release.gpg [198 B]
Ign:12 http://download.openvz.org/debian wheezy Release.gpg
Fetched 198 B in 1s (180 B/s)
Reading package lists... Done
W: GPG error: http://download.openvz.org/debian wheezy Release: The
following signatures were invalid: DA2458173935F9DE9B76BA7547B5DBAB0FCA9BAC
W: The repository 'http://download.openvz.org/debian wheezy Release' 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.

$ sudo nano /etc/apt/sources.list.d/openvz.list
$ sudo apt-get update
Ign:1 http://repos.actiu.net/libre stretch InRelease
Ign:2 http://debian.grn.cat/debian stretch InRelease

Hit:3 http://repos.actiu.net/libre stretch Release

Hit:4 http://debian.grn.cat/debian stretch-updates InRelease

Hit:5 http://security.debian.org/debian-security stretch/updates
InRelease
Hit:7 http://debian.grn.cat/debian stretch-backports InRelease

Ign:8 http://download.openvz.org/debian jessie InRelease
Hit:9 http://debian.grn.cat/debian stretch Release
Get:11 http://download.openvz.org/debian jessie Release [13.4 kB]

Get:12 http://download.openvz.org/debian jessie Release.gpg [198 B]
Ign:12 http://download.openvz.org/debian jessie Release.gpg
Get:13 http://download.openvz.org/debian jessie/main amd64 Packages [1883 B]
Get:14 http://download.openvz.org/debian jessie/main amd64 Contents
(deb) [1264 B]
Fetched 16.7 kB in 1s (9721 B/s)
Reading package lists... Done
W: GPG error: http://download.openvz.org/debian jessie Release: The
following signatures were invalid: DA2458173935F9DE9B76BA7547B5DBAB0FCA9BAC
W: The repository 'http://download.openvz.org/debian jessie Release' 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.


Tried using https://download.openvz.org/debian/archive.key with apt-key
and saving https://download.openvz.org/debian/dists/jessie/Release.gpg
to /usr/share/keyrings