Youtube video screen disappears

[satimis]

Hi all,

Could you please explain how it would happen?

After installing the package "cpu-checker" playing youtube video on Firefox there is no video screen displayed, only sound. There is no problem on Google Chrome.

After un-installing "cpu-checker" the video screen comes back again?

Why?

Thanks

Regards
satimis

[Autodave]

That is interesting. I do know that a not-too-long-ago release of Firefox caused various issues with sound mostly and some video. You should be runni9ng version 56.0 (or higher if it exists). If not, run in a terminal:

sudo apt-get update
sudo apt-get upgrade

That should give you the current one.

[satimis]

That is interesting. I do know that a not-too-long-ago release of Firefox caused various issues with sound mostly and some video. You should be runni9ng version 56.0 (or higher if it exists). If not, run in a terminal:

sudo apt-get update
sudo apt-get upgrade

That should give you the current one.

Just ran
$ sudo apt update ; sudo apt upgrade

..........
.........
All packages are up to date.
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

Firefox
51.0.1 (64-bit)

[vasa1]

@satimis,

Please post the output of

apt policy firefox

[Frogs Hair]

Were there any packages removed in the process of installing cpu-checker ? This could happen if there is a conflict.

[ajgreeny]

Really Firefox 51.0.1?
What version of Ubuntu are you using?

[satimis]

@satimis,

Please post the output of

apt policy firefox

⟫ apt policy firefox

firefox:
  Installed: 51.0.1+build2-0ubuntu0.16.04.1
  Candidate: 51.0.1+build2-0ubuntu0.16.04.1
  Version table:
 *** 51.0.1+build2-0ubuntu0.16.04.1 100
        100 /var/lib/dpkg/status
     44.0.2+build1-0ubuntu1 500
        500 http://ubuntu.01link.hk xenial/main amd64 Packages

satimis

[satimis]

Were there any packages removed in the process of installing cpu-checker ? This could happen if there is a conflict.

There was no specific warning during installing cpu-checker

Regards

[satimis]

Really Firefox 51.0.1?

Yes.

I found it on
-> Help -> About Firefox

please refers to attached screenshot

What version of Ubuntu are you using?

⟫ lsb_release -a

No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.1 LTS
Release:        16.04
Codename:       xenial

Edit
===
⟫ firefox -v

Mozilla Firefox 51.0.1

satimis

[ajgreeny]

Have you run

sudo apt-get autoremove

to also remove any dependencies of cpu-checker, and did you remove or purge the package?

If you use synaptic package manager search using that for firefox, as something is definitely wrong if FF-51 is the version available to you.

Let's also see the output of

cat /etc/apt/sources.list

to check the repos being searched.