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[Bug 1596067] Re: Data from such a repository can't be authenticated

 

Same issue for me along with multiple other problems logout not working, Graphics display not propagating until I mouse over even then its not permanent fix.
Maybe we can start with this: screen display problem

lspci -nnk | grep VGA -A1  
00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 18)
	Subsystem: Dell Core Processor Integrated Graphics Controller [1028:0457]

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https://bugs.launchpad.net/bugs/1596067

Title:
  Data from such a repository can't be authenticated

Status in Cairo-Dock Core:
  New

Bug description:
  When I try to update (sudo apt-get update) Ubuntu 16.04 on any pc who
  has cairo dock installed, i get the following error:

  W: The repository 'http://ppa.launchpad.net/cairo-dock-team/ppa/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/cairo-dock-team/ppa/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
  E: Einige Indexdateien konnten nicht heruntergeladen werden. Sie wurden ignoriert oder alte an ihrer Stelle benutzt.

  I added the ppa this way:
  echo "deb http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu $(lsb_release -sc) main # Cairo-Dock-PPA" | sudo tee -a /etc/apt/sources.list
      	sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E80D6BF5

  The error is really anoying because the update Error throw an error
  that I should check my Internet Connection...

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