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W: The repository 'http://ppa.launchpad.net/skunk/pepper-flash/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/skunk/pepper-flash/ubuntu/dists/xenial/main/source/Sources  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
Eric Carvalho
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Biki Deka
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  • is it the output of your 'sudo apt update'? – Redbob Aug 30 '17 at 02:35
  • Don't use a PPA to install that -- it's out of date, and there are no new releases for your 16.04+ release (aka xenial; see code names here: https://wiki.ubuntu.com/Releases ) . Duplicate of https://askubuntu.com/questions/805639/i-cannot-install-pepper-flash-on-ubuntu-16-04/805641 – michael Aug 30 '17 at 02:43
  • Note that "16.04" is an Ubuntu release from "2016" (16.x), April (month 04). Ubuntu releases in April (04) and October (10), so you should consider updating (to latest software for 16.04) and then upgrading to 16.10 and then upgrading again to 17.04. – michael Aug 30 '17 at 02:46
  • yes sir it is the out put of "sudo apt-get update" then how can i update my system to install mysql .Basically i was trying to install mysql on my system ubuntu 16.04 LTS. – Biki Deka Aug 30 '17 at 14:46

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