I have meant to ask this for some time when updating my ubuntu-mate 16.04 RPI3.

When running sudo apt-get update & sudo apt-get dist-upgrade

The below error is obtain.

Is this something to correct or ignore?

Setting up fliusb-dkms (1.3+r3115~201706011729~ubuntu16.04.1) ...
Loading new fliusb-1.3+r3115~201706011729~ubuntu16.04.1 DKMS files...
dpkg: warning: version '*-*' has bad syntax: version number does not start with digit
It is likely that 4.9.28-v7+ belongs to a chroot's host
Module build for the currently running kernel was skipped since the
kernel source for this kernel does not seem to be installed.
Setting up libfli1 (1.8.ubuntu5+r3115~201706011721~ubuntu16.04.1) ...

Thank you