unable to play video after upgraded to ubuntu 16.04 from 14.04

[Colin Law]

On 28 April 2016 at 11:22, Ralf Mardorf <silver.bullet at zoho.com> wrote:
> Perhaps the original poster's default language is an issue.
>
> 李白|字一日 <calidion at gmail.com> please run the commands this way:
>
>   sudo -i
>   LANG=C apt-get update
>   LANG=C apt-get dist-upgrade
>   logout
>
> If any warnings and/or errors occur copy and paste just the
> warnings and/or errors and stop, do not continue with the following
> commands. Assumed no warnings and/or errors occur, then do not post the
> output, but continue with the following commands:
>
>   sudo -i
>   LANG=C rm /var/cache/apt/archives/ligbm*

Unfortunately I mistyped the above line when I initially posted it,
and Ralf then copied it, it should read
LANG=C rm /var/cache/apt/archives/libgbm*
The purpose of which was to make sure that it re-downloaded the
package deb file just in case it was corrupted.  It probably won't
make any difference but it is probably worth trying this again, so

  sudo -i
  LANG=C rm /var/cache/apt/archives/libgbm*
  LANG=C apt-get install --reinstall libgbm1
  LANG=C ls -l /usr/lib/x86_64-linux-gnu/libgbm*
  logout

This time at the install command it should show that it has to
download the file (last time it said downloading 0 of ...)

As I said it probably won't make a difference, but worth checking.

Is the system behaving perfectly in all other respects or do you have
other odd things happening, which might indicate a disc or other
problem?

If you run the Disks utility (from the Dash) then select the disk and
then from the menu select Smart Data it should show you whether there
are any problems.

Colin