Ign:1 https://download.01.org/gfx/ubuntu/17.04/main zesty InRelease Err:2 https://download.01.org/gfx/ubuntu/17.04/main zesty Release 503 Service Unavailable Hit:3 http://us.archive.ubuntu.com/ubuntu zesty InRelease Get:4 http://us.archive.ubuntu.com/ubuntu zesty-updates InRelease [89.2 kB] Get:5 http://security.ubuntu.com/ubuntu zesty-security InRelease [89.2 kB] Get:6 http://us.archive.ubuntu.com/ubuntu zesty-backports InRelease [89.2 kB] Get:7 http://us.archive.ubuntu.com/ubuntu zesty-updates/main amd64 DEP-11 Metadata [52.7 kB] Get:8 http://us.archive.ubuntu.com/ubuntu zesty-updates/main DEP-11 64x64 Icons [26.3 kB] Get:9 http://us.archive.ubuntu.com/ubuntu zesty-updates/universe amd64 DEP-11 Metadata [171 kB] Get:10 http://us.archive.ubuntu.com/ubuntu zesty-updates/universe DEP-11 64x64 Icons [223 kB] Get:11 http://us.archive.ubuntu.com/ubuntu zesty-updates/multiverse amd64 DEP-11 Metadata [5,840 B] Get:12 http://us.archive.ubuntu.com/ubuntu zesty-backports/universe amd64 DEP-11 Metadata [5,140 B] Get:13 http://security.ubuntu.com/ubuntu zesty-security/main amd64 DEP-11 Metadata [12.5 kB] Get:14 http://security.ubuntu.com/ubuntu zesty-security/main DEP-11 64x64 Icons [11.6 kB] Get:15 http://security.ubuntu.com/ubuntu zesty-security/universe amd64 DEP-11 Metadata [20.7 kB] Get:16 http://security.ubuntu.com/ubuntu zesty-security/universe DEP-11 64x64 Icons [36.5 kB] Get:17 http://security.ubuntu.com/ubuntu zesty-security/multiverse amd64 DEP-11 Metadata [208 B] Reading package lists... Done E: The repository 'https://download.01.org/gfx/ubuntu/17.04/main zesty Release' does no longer have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
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The server at https://download.01.org/gfx/ubuntu/17.04/main
is down. Try again later.
If you like, you can temporarily comment out this line like so...
cd /etc/apt
grep download.01.org sources.list
If it DOES find download.01.org there, then...
sudo pico /etc/apt/sources.list
sudo apt-get update
and comment out the line that contains download.01.org with a # at the beginning of that line.
If it DOES NOT find download.01.org, then...
cd /etc/apt/sources.list.d
grep download.01.org *.list
#note the filename that it finds
sudo pico /etc/apt/sources.list.d/{enter filename here}
sudo apt-get update
and comment out the line that contains download.01.org with a # at the beginning of that line.

heynnema
- 70,711
etc/apt/sources.list
and comment out the linehttps://download.01.org/gfx/ubuntu/17.04/main zesty Release
- see https://askubuntu.com/questions/837099/cannot-remove-a-repository – Charles Green Sep 02 '17 at 17:35/etc/apt/sources.list.d
– Charles Green Sep 02 '17 at 21:31