apt install libavcodec-extra asks for cdrom

[Freek van Hemert]

Netflix does not work on Firefox on 20.04, even after enabling DRM. A guide somewhere tells me I need libavcodec-extra, this reports:

```
$ sudo apt install libavcodec-extra
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  i965-va-driver intel-media-va-driver libaom0 libaribb24-0 libavcodec-extra58 libavutil56 libcodec2-0.9 libgsm1 libigdgmm11 libopencore-amrnb0 libopencore-amrwb0 libshine3 libsnappy1v5 libswresample3
  libva-drm2 libva-x11-2 libva2 libvdpau1 libvo-amrwbenc0 libx264-155 libx265-179 libxvidcore4 libzvbi-common libzvbi0 mesa-va-drivers mesa-vdpau-drivers ocl-icd-libopencl1 va-driver-all vdpau-driver-all
Suggested packages:
  i965-va-driver-shaders opencl-icd libvdpau-va-gl1 nvidia-vdpau-driver nvidia-legacy-340xx-vdpau-driver nvidia-legacy-304xx-vdpau-driver
The following NEW packages will be installed:
  i965-va-driver intel-media-va-driver libaom0 libaribb24-0 libavcodec-extra libavcodec-extra58 libavutil56 libcodec2-0.9 libgsm1 libigdgmm11 libopencore-amrnb0 libopencore-amrwb0 libshine3 libsnappy1v5
  libswresample3 libva-drm2 libva-x11-2 libva2 libvdpau1 libvo-amrwbenc0 libx264-155 libx265-179 libxvidcore4 libzvbi-common libzvbi0 mesa-va-drivers mesa-vdpau-drivers ocl-icd-libopencl1 va-driver-all
  vdpau-driver-all
0 upgraded, 30 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/24,4 MB of archives.
After this operation, 136 MB of additional disk space will be used.
Do you want to continue? [Y/n]
Media change: please insert the disc labeled
 'Ubuntu 20.04 LTS _Focal Fossa_ - Beta amd64 (20200402)'
in the drive '/cdrom/' and press [Enter]
```

Pressing enter keeps repeating the last text.

[Freek van Hemert (freekvh)]

I fixed it by commenting out the first line of /etc/apt/sources.list*:

#deb cdrom:[Ubuntu 20.04 LTS _Focal Fossa_ - Beta amd64 (20200402)]/ focal main restricted

This fixes the apt bug and Netflix now also works in Firefox!

* As suggested in the Ubuntu Podcast Chatter Telegram channel.

[Julian Andres Klode (juliank)]

Then either supply the medium you installed from or remove the entry. What did you install from?

[Freek van Hemert (freekvh)]

What, I'm supposed to keep my usb stick (not even cdrom) around in case somewhere down the line (could be weeks/months) I want to get Netflix to work in my browser?? Even though there is a perfectly good version of libavcodec-extra in the online repos? Are you serious?

[Freek van Hemert (freekvh)]

Oh sorry, you also suggested to remove the entry I see now. Still, I think that is too much to ask from certain users. This should just work, right?

[Sebastien Bacher (seb128)]

Did you activate that entry? It's there but not enabled by default...

[Freek van Hemert (freekvh)]

No, I didn't change anything to /etc/apt/sources.list, until I commented out the first line (deb cdrom:[Ubuntu 20.04 LTS _Focal Fossa_ - Beta amd64 (20200402)]/ focal main restricted).

[Launchpad Janitor (janitor)]

[Expired for Ubuntu because there has been no activity for 60 days.]