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Issue Plesk Premium Mail - Unable to install Kolab software packages

This is the log from :
/var/log/plesk/panel.log

Code:
stderr:
filemng: Error occurred during /usr/bin/base64 command.

[2019-12-08 19:51:57.427] ERR [panel] Task failed: id=61, pid=18261, type=ext-kolab-task_install, error=filemng failed: filemng: Error occurred during /usr/bin/base64 command.
[2019-12-08 19:51:57.427] ERR [panel] filemng failed: filemng: Error occurred during /usr/bin/base64 command.
[2019-12-08 19:54:46.640] ERR [extension/kolab] Not successfully executed: 'apt-get -y update'
[2019-12-08 19:54:46.640] ERR [extension/kolab] stderr:
[2019-12-08 19:55:12.708] ERR [extension/kolab] Not successfully executed: 'apt-get -y update'
[2019-12-08 19:55:12.708] ERR [extension/kolab] stderr:
[2019-12-08 19:55:19.982] ERR [extension/kolab] Not successfully executed: 'aptitude -d -y install kolab-plesk'
[2019-12-08 19:55:19.982] ERR [extension/kolab] stderr:
[2019-12-08 19:55:26.654] ERR [extension/kolab] Not successfully executed: 'aptitude -o Dpkg::Options::="--force-confold" -y install guam'
[2019-12-08 19:55:26.654] ERR [extension/kolab] stderr:
[2019-12-08 19:55:33.359] ERR [extension/kolab] Not successfully executed: 'aptitude -o Dpkg::Options::="--force-confold" -y install kolab-plesk'
[2019-12-08 19:55:33.359] ERR [extension/kolab] stderr:
[2019-12-08 19:55:34.062] ERR [util_exec] proc_close() failed ['/opt/psa/admin/bin/filemng' 'root' 'base64' '/etc/guam/sys.config' '--allow-root'] with exit code [1]
[2019-12-08 19:55:34.063] ERR [panel] '/opt/psa/admin/bin/filemng' 'root' 'base64' '/etc/guam/sys.config' '--allow-root' failed with code 1.

stdout:
base64: /etc/guam/sys.config: No such file or directory
filemng: Error occurred during /usr/bin/base64 command.


stderr:
filemng: Error occurred during /usr/bin/base64 command.

[2019-12-08 19:55:34.068] ERR [panel] Task failed: id=62, pid=21855, type=ext-kolab-task_install, error=filemng failed: filemng: Error occurred during /usr/bin/base64 command.
[2019-12-08 19:55:34.069] ERR [panel] filemng failed: filemng: Error occurred during /usr/bin/base64 command.
 
look here if i make apt-get:
Code:
root@mx1:~# apt-get update
Get:1 http://security.debian.org jessie/updates InRelease [44.9 kB]
Ign:2 http://cdn-fastly.deb.debian.org/debian jessie InRelease
Hit:3 http://cdn-fastly.deb.debian.org/debian jessie-updates InRelease
Ign:4 https://packages.grafana.com/oss/deb stable InRelease
Ign:5 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch InRelease
Hit:6 http://cdn-fastly.deb.debian.org/debian jessie Release
Hit:7 http://autoinstall.plesk.com/debian/PMM_0.1.10 stretch InRelease
Hit:8 http://autoinstall.plesk.com/pool/PSA_18.0.21_1659 stretch InRelease
Hit:9 http://autoinstall.plesk.com/PHP73_17 stretch InRelease
Hit:10 http://autoinstall.plesk.com/PHP74_17 stretch InRelease
Ign:11 https://packages.grafana.com/oss/deb stable Release
Ign:12 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch Release
Ign:13 https://packages.grafana.com/oss/deb stable/main amd64 Packages
Ign:14 https://packages.grafana.com/oss/deb stable/main i386 Packages
Ign:15 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates Sources
Ign:16 https://packages.grafana.com/oss/deb stable/main all Packages
Ign:18 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release Sources
Ign:19 http://debian.mirror.serverloft.de/debian stretch InRelease
Hit:20 http://debian.mirror.serverloft.de/debian-security stretch/updates InRelease
Hit:21 http://debian.mirror.serverloft.de/debian stretch Release
Ign:22 https://packages.grafana.com/oss/deb stable/main Translation-en
Ign:23 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release amd64 Packages
Ign:13 https://packages.grafana.com/oss/deb stable/main amd64 Packages
Ign:24 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release i386 Packages
Ign:14 https://packages.grafana.com/oss/deb stable/main i386 Packages
Ign:25 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release all Packages
Ign:16 https://packages.grafana.com/oss/deb stable/main all Packages
Ign:26 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release Translation-en
Ign:22 https://packages.grafana.com/oss/deb stable/main Translation-en
Ign:27 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates all Packages
Ign:13 https://packages.grafana.com/oss/deb stable/main amd64 Packages
Ign:28 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates i386 Packages
Ign:14 https://packages.grafana.com/oss/deb stable/main i386 Packages
Ign:16 https://packages.grafana.com/oss/deb stable/main all Packages
Ign:22 https://packages.grafana.com/oss/deb stable/main Translation-en
Ign:13 https://packages.grafana.com/oss/deb stable/main amd64 Packages
Ign:14 https://packages.grafana.com/oss/deb stable/main i386 Packages
Ign:16 https://packages.grafana.com/oss/deb stable/main all Packages
Ign:22 https://packages.grafana.com/oss/deb stable/main Translation-en
Ign:13 https://packages.grafana.com/oss/deb stable/main amd64 Packages
Ign:14 https://packages.grafana.com/oss/deb stable/main i386 Packages
Ign:16 https://packages.grafana.com/oss/deb stable/main all Packages
Ign:30 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates amd64 Packages
Ign:22 https://packages.grafana.com/oss/deb stable/main Translation-en
Err:13 https://packages.grafana.com/oss/deb stable/main amd64 Packages
  gnutls_handshake() failed: Public key signature verification has failed.
Ign:31 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates Translation-en
Ign:14 https://packages.grafana.com/oss/deb stable/main i386 Packages
Ign:15 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates Sources
Ign:16 https://packages.grafana.com/oss/deb stable/main all Packages
Ign:18 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release Sources
Ign:22 https://packages.grafana.com/oss/deb stable/main Translation-en
Ign:23 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release amd64 Packages
Ign:24 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release i386 Packages
Ign:25 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release all Packages
Ign:26 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release Translation-en
Ign:27 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates all Packages
Ign:28 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates i386 Packages
Ign:30 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates amd64 Packages
Ign:31 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates Translation-en
Ign:15 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates Sources
Ign:18 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release Sources
Ign:23 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release amd64 Packages
Ign:24 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release i386 Packages
Ign:25 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release all Packages
Ign:26 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release Translation-en
Ign:27 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates all Packages
Ign:28 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates i386 Packages
Ign:30 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates amd64 Packages
Ign:31 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates Translation-en
Ign:15 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates Sources
Ign:18 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release Sources
Ign:23 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release amd64 Packages
Ign:24 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release i386 Packages
Ign:25 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release all Packages
Ign:26 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release Translation-en
Ign:27 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates all Packages
Ign:28 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates i386 Packages
Ign:30 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates amd64 Packages
Ign:31 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates Translation-en
Ign:15 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates Sources
Ign:18 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release Sources
Ign:23 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release amd64 Packages
Ign:24 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release i386 Packages
Ign:25 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release all Packages
Ign:26 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release Translation-en
Ign:27 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates all Packages
Ign:28 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates i386 Packages
Ign:30 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates amd64 Packages
Ign:31 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates Translation-en
Err:15 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates Sources
  gnutls_handshake() failed: Public key signature verification has failed.
Ign:18 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release Sources
Ign:23 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release amd64 Packages
Ign:24 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release i386 Packages
Ign:25 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release all Packages
Ign:26 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/release Translation-en
Ign:27 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates all Packages
Ign:28 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates i386 Packages
Ign:30 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates amd64 Packages
Ign:31 https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch/updates Translation-en
Fetched 44.9 kB in 19s (2252 B/s)
Reading package lists... Done
W: The repository 'https://packages.grafana.com/oss/deb stable Release' does not have a Release file.
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.
W: The repository 'https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch stretch Release' does not have a Release file.
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.
E: Failed to fetch https://packages.grafana.com/oss/deb/dists/stable/main/binary-amd64/Packages  gnutls_handshake() failed: Public key signature verification has failed.
E: Failed to fetch https://mirror.kolabenterprise.com/plesk-17/kolab-16/stretch/dists/stretch/updates/source/Sources  gnutls_handshake() failed: Public key signature verification has failed.
E: Some index files failed to download. They have been ignored, or old ones used instead.
root@mx1:~#

There are many ignores...... how can i clean apt?
 
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