I think I have found the root cause of this bug: /lib/modules/3.13.0-44-generic/modules.dep (and its .bin counterpart) are wrong and don't include the -extra modules.
You can easily verify diff with a diff from -43-generic modules.dep
In attachment the modprobe failure (ran on a -43 kernel) that documents this problem.
I think I have found the root cause of this bug: /lib/modules/ 3.13.0- 44-generic/ modules. dep (and its .bin counterpart) are wrong and don't include the -extra modules.
You can easily verify diff with a diff from -43-generic modules.dep
In attachment the modprobe failure (ran on a -43 kernel) that documents this problem.