unable to play video after upgraded to ubuntu 16.04 from 14.04

[Ralf Mardorf]

On Tue, 3 May 2016 13:49:30 +0200, Liam Proven wrote:
>On 29 April 2016 at 12:13, Ralf Mardorf <silver.bullet at zoho.com> wrote:
>> On Fri, 29 Apr 2016 03:05:21 +0200, Liam Proven wrote:  
>>>sudo apt-get clean  
>>
>> I wouldn't recommend to clean the complete cache, even while my cache
>> usually is empty, but I have a backup strategy and archive the
>> cache.  
>
>
>Why not? It's just a cache. The next time you install a package, apt
>will start rebuilding it.
>
>Indeed, why bother backing it up? I empty mine regularly as part of
>routine system housekeeping. There is nothing in there you'll ever
>need again that will not be quickly and automatically replaced,
>surely?

It might be useful for rollback purpose. Sometimes downgrading might be
required to fix an issue.