Ubuntu 14.04 reached end of standard support in April 2019:
https://wiki.ubuntu.com/Releases
If you would like to continue with free support then please update to a
newer release and tell us if the problem still occurs.
If you would like to continue with Ubuntu 14.04 then there is still a
paid
** Summary changed:
- impossible to build kernel
+ impossible to build kernel modules for virtualbox
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https://bugs.launchpad.net/bugs/1829466
Title:
impossible to build kernel modules
