Virtualmin doesn’t upgrade: How to fix invalid signature Virtualmin apt packages

Whilst updating Virtualmin, you might get this error:

Err:6 https://software.virtualmin.com/vm/6/gpl/apt virtualmin-focal InRelease
The following signatures were invalid: EXPKEYSIG D9F9010760D62A6B Virtualmin, Inc. (Package signing key for Virtualmin 6) <security@virtualmin.com>
Err:7 https://software.virtualmin.com/vm/6/gpl/apt virtualmin-universal InRelease
The following signatures were invalid: EXPKEYSIG D9F9010760D62A6B Virtualmin, Inc. (Package signing key for Virtualmin 6) <security@virtualmin.com>
Reading package lists... Done

Here is the command:

virtualmin setup-repos

I found that command here:

• https://forum.virtualmin.com/t/expired-key-for-virtualmin-apt-repo/126655

If that doesn’t work, do this instead:

sudo sh -c "$(curl -fsSL https://software.virtualmin.com/gpl/scripts/virtualmin-install.sh)" -- --setup