Thanks again for your reply,

To be specific, I did exactly this:

- Install linux source code, then copy the mentioned file to the folder
using: cp /usr/src/linux-headers-5.4.0-59/fs/mount.h /lib/modules/$(uname
-r)/build

- Run sudo dkms autoinstall (I also did reboot)

- Create the session and attempt to add the context

However, I'm getting the same error.

On Tue, Jan 12, 2021 at 9:05 AM Michael Jeanson <mjeanson@efficios.com>
wrote:

> On 2021-01-09 09 h 03, Mohammad Kavousi wrote:
> > Michael,
> >
> > Thank you for your swift response. However, for the first part, I'm not
> > sure what it means by "using" the full kernel source. How would I use it
> > with lttng-modules?
> >
> > As for the quick hack part, I grabbed the kernel source and copied the
> > mount.h onto the folder you mentioned, and it did not help. I don't
> > expect lttng to automatically find that file and use it; also there are
> > no other header files in the package build directory. Could you kindly
> > give us more instructions?
> >
> > Thanks,
> > Mohammad
>
> The lttng modules are shipped in Ubuntu as a dkms package which means
> they are built directly on your machine for each kernel version you
> install. So after adding the required file in your headers you'll need
> to rebuild the modules with dkms and unload / reload them in your
> running kernel or just reboot the machine.
>
> To rebuild all installed dkms modules for the current kernel:
>
>    sudo dkms autoinstall
>