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I get the following error when I run sudo apt-get update: 

Reading package lists... Error!
W: The repository 'http://ppa.launchpad.net/gijzelaar/opencv2.3/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/gijzelaar/opencv2.3/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.
E: Unable to parse package file /var/lib/apt/lists/ppa.launchpad.net_gijzelaar_opencv2.3_ubuntu_dists_xenial_main_binary-amd64_Packages (1)
E: Unable to parse package file /var/lib/apt/lists/ppa.launchpad.net_gijzelaar_opencv2.3_ubuntu_dists_xenial_main_binary-i386_Packages (1)
E: Unable to parse package file /var/lib/apt/lists/ppa.launchpad.net_gijzelaar_opencv2.3_ubuntu_dists_xenial_main_binary-all_Packages (1)
E: Unable to parse package file /var/lib/apt/lists/ppa.launchpad.net_gijzelaar_opencv2.3_ubuntu_dists_xenial_main_i18n_Translation-en (1)
W: You may want to run apt-get update to correct these problems
E: The package cache file is corrupted

How can I solve this? My ubuntu version is 16.04

Monojit Sarkar
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  • You should know that PPAs may not have files for your Ubuntu version after some time. What is your Ubuntu version? – N0rbert Feb 26 '18 at 13:56
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    I had a look in http://ppa.launchpad.net/gijzelaar/opencv2.3/ubuntu/dists/ (one of the PPAs you'd added) and the only supported releases were 11.04 & 11.10. If you add PPAs, only add ones that provide support for 16.04 (Xenial) or whatever version of Ubuntu you are using. – guiverc Feb 26 '18 at 13:56

1 Answers1

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The ppa:gijzelaar/opencv2.3 does not have packages for 16.04 LTS (xenial).

The solution is to remove problematic PPA:

sudo add-apt-repository -r ppa:gijzelaar/opencv2.3
sudo rm /var/lib/apt/lists/ppa.launchpad.net_gijzelaar_opencv2.3*

Then run sudo apt-get update and so on.

N0rbert
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