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I'm new to Linux and Ubuntu so I'm still learning many of the features it has to offer. Today I installed OBS and a icon theme (shadow-icons) and when I run sudo apt-get update I get these errors.

W: The repository 'http://ppa.launchpad.net/kirillshkrogalev/ffmpeg-next/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
W: The repository 'http://ppa.launchpad.net/upubuntu-com/icons/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://ppa.launchpad.net/kirillshkrogalev/ffmpeg-next/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Failed to fetch http://ppa.launchpad.net/upubuntu-com/icons/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

I've looked all over the web for a solution and can't seem to find one. Only thing I could locate remotely close was commenting out 

# deb cdrom:[Ubuntu 16.04.3 LTS _Xenial Xerus_ - Release amd64 (201708$

but alas this helps none and was already commented out before hand. Any help would be appreciated for a solution to this issue. Thanks!

jakster
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1 Answers1

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This error says that there is a problem with a software repository. One solution that can work for you is to remove this repository from the list. This way apt-get will not look for this problematic repository. (Unless you really need that one, but we could look into this later, if this is the case.)

The configuration files of apt-get are in:

  • the text file: /etc/apt/sources.list
  • all text files located in the dir: /etc/apt/sources.list.d

You can "soft" remove (i.e. "comment them out") the repositories that are listed in the above files by adding # character at the beginning of the line where the repository is listed (just as in the example you gave about #deb cdrom:...).

Tips:

You will need a superuser privileges to complete this, and one way to elevate your privileges is e.g. gksudo gedit /etc/apt/sources.list. You can then browse other files in gedit's open-dialog-box,

You can easily find the file to work with by running:

grep -ril kirillshkrogalev /etc/apt
grep -ril upubuntu-com /etc/apt

Edit: Thank you Chai T. Rex for pointing out this issue

Community
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Patryk Mazurkiewicz
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