Usually, it's the lttng-sessiond's job to load the kernel modules.

So the quick fix here would be to start a session daemon at boot with of
course root privileges.

Thanks!
David

Thibault, Daniel:
>    My two Ubuntu installations have the same set of LTTng modules and tools 
> (they were all built from the same git.lttng.org packages) but different 
> kernels and installation histories.  The "clean" machine has kernel 
> linux-virtual (3.2.0-36-virtual), the other one has linux-generic 
> (3.2.0-35-generic).  After installing LTTng and rebooting, the clean machine 
> does *not* load the lttng kernel modules, while the other one does.  
> /etc/modules and /etc/modprobe.d are the same, the .ko are present in 
> /lib/modules/<kernel>/extra in both cases.  The clean machine's lttng kernel 
> modules can be loaded using modprobe without demur, so there is no problem 
> there.
> 
>    At first I thought this was because the clean machine had not installed 
> the dkms package yet, but adding it made no difference: the lttng modules do 
> not load.
> 
>    How can I get the clean machine to load the lttng kernel modules at boot 
> time?
> 
> Daniel U. Thibault
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