Virtualmin update

Anyone any ideas please?

Resynchronizing package list with command apt-get update …

Resynchronizing package list with command apt-get update …

Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]

Hit:2 http://gb.archive.ubuntu.com/ubuntu xenial InRelease

Get:3 http://gb.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]

Get:4 http://gb.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]

Ign:5 http://software.virtualmin.com/gpl/ubuntu virtualmin-xenial InRelease

Ign:6 http://software.virtualmin.com/gpl/ubuntu virtualmin-universal InRelease

Hit:8 http://software.virtualmin.com/gpl/ubuntu virtualmin-universal Release

Get:7 http://software.virtualmin.com/gpl/ubuntu virtualmin-xenial Release [4741 B]

Get:10 http://software.virtualmin.com/gpl/ubuntu virtualmin-xenial Release.gpg [198 B]

Err:10 http://software.virtualmin.com/gpl/ubuntu virtualmin-xenial Release.gpg
The following signatures were invalid: BADSIG E8DD3FA0A0BDBCF9 Virtualmin, Inc. security@virtualmin.com

Fetched 311 kB in 0s (362 kB/s)

Reading package lists…

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://software.virtualmin.com/gpl/ubuntu virtualmin-xenial Release: The following signatures were invalid: BADSIG E8DD3FA0A0BDBCF9 Virtualmin, Inc. security@virtualmin.com

W: Failed to fetch http://software.virtualmin.com/gpl/ubuntu/dists/virtualmin-xenial/Release.gpg The following signatures were invalid: BADSIG E8DD3FA0A0BDBCF9 Virtualmin, Inc. security@virtualmin.com

W: Some index files failed to download. They have been ignored, or old ones used instead.

… resynchronization complete.

Upgrading all packages with command apt-get -y -f upgrade …

Reading package lists…

Building dependency tree…

Reading state information…

Calculating upgrade…

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

… upgrade complete.

I have the same problem on Debian 8:

Reading package lists… Done

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://software.virtualmin.com virtualmin-jessie Release: The following signatures were invalid: BADSIG E8DD3FA0A0BDBCF9 Virtualmin, Inc. security@virtualmin.com

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://software.virtualmin.com virtualmin-universal Release: The following signatures were invalid: BADSIG E8DD3FA0A0BDBCF9 Virtualmin, Inc. security@virtualmin.com

W: Failed to fetch http://software.virtualmin.com/gpl/debian/dists/virtualmin-jessie/Release

W: Failed to fetch http://software.virtualmin.com/gpl/debian/dists/virtualmin-universal/Release

W: Some index files failed to download. They have been ignored, or old ones used instead.