Comment 13 for bug 1872950

Hi, I found the same issue with nvidia-340 on groovy (kernel 5.8).

Setting up nvidia-340 (340.108-0ubuntu5) ...
dpkg: error: version '-' has bad syntax: revision number is empty
dpkg: error: version '-' has bad syntax: revision number is empty
dpkg: error: version '-' has bad syntax: revision number is empty
dpkg: error: version '-' has bad syntax: revision number is empty
dpkg: error: version '-' has bad syntax: revision number is empty
update-initramfs: deferring update (trigger activated)
INFO:Enable nvidia-340
DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/lenovo_thinkpad
DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/put_your_quirks_here
DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/dell_latitude
Adding system user `nvidia-persistenced' (UID 132) ...
Adding new group `nvidia-persistenced' (GID 141) ...
Adding new user `nvidia-persistenced' (UID 132) with group `nvidia-persistenced' ...
Not creating home directory `/'.
Loading new nvidia-340-340.108 DKMS files...
Building for 5.8.0-22-generic
Building for architecture x86_64
Building initial module for 5.8.0-22-generic
ERROR (dkms apport): kernel package linux-headers-5.8.0-22-generic is not supported
Error! Bad return status for module build on kernel: 5.8.0-22-generic (x86_64)
Consult /var/lib/dkms/nvidia-340/340.108/build/make.log for more information.
dpkg: error processing package nvidia-340 (--configure):
 installed nvidia-340 package post-installation script subprocess returned error exit status 10
Processing triggers for desktop-file-utils (0.24-1ubuntu4) ...
Processing triggers for mime-support (3.64ubuntu1) ...
Processing triggers for gnome-menus (3.36.0-1ubuntu1) ...
Processing triggers for libc-bin (2.32-0ubuntu3) ...
Processing triggers for man-db (2.9.3-2) ...
Processing triggers for bamfdaemon (0.5.3+18.04.20180207.2-0ubuntu2) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for initramfs-tools (0.137ubuntu12) ...
update-initramfs: Generating /boot/initrd.img-5.8.0-22-generic
Errors were encountered while processing:
 nvidia-340

If you need my log file, please let me know.