Wrong url in elementary.list and patches.list files

[thisara kasun]

I just noticed that following files in /etc/apt/sources.list.d have wrong urls which causes Elementary Loki updates not be delivered fine.

-elementary.list-
deb http://ppa.launchpad.net/elementary-os/stable/ubuntu loki main
deb-src http://ppa.launchpad.net/elementary-os/stable/ubuntu loki main

-patches.list-
deb http://ppa.launchpad.net/elementary-os/os-patches/ubuntu loki main
deb-src http://ppa.launchpad.net/elementary-os/os-patches/ubuntu loki main

Which needs to be updated as follows,

-elementary.list-
deb http://ppa.launchpad.net/elementary-os/stable/ubuntu xenial main
deb-src http://ppa.launchpad.net/elementary-os/stable/ubuntu xenial main

-patches.list-
deb http://ppa.launchpad.net/elementary-os/os-patches/ubuntu xenial main
deb-src http://ppa.launchpad.net/elementary-os/os-patches/ubuntu xenial main

Here's the 'apt update' error before the fix,
---
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/elementary-os/stable/ubuntu loki 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.
W: The repository 'http://ppa.launchpad.net/elementary-os/os-patches/ubuntu loki 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/elementary-os/stable/ubuntu/dists/loki/main/binary-amd64/Packages 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/elementary-os/os-patches/ubuntu/dists/loki/main/source/Sources 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
---

This brought updates for many pantheon-specific stuff.
If this is common for other users too,they might be missing future updates from Elementary not even knowing so.

[Chinarut (chinarut)]

as of a fresh install of 5.1 (hera) as of March 7, 2020, this issue is still outstanding.

"hera: needed to be replaced with "bionic" in the following 4 source lists:

/etc/apt/sources.list
/etc/apt/sources.list.d/elementary.list
/etc/apt/sources.list.d/patches.list
/etc/apt/sources.list.d/appcenter.list

[Vasyl Zaulychny (zaulychny)]

Same on my laptop running elementary os "Hera". The only diff is that file

/etc/apt/sources.list

is correct and no <hera> mentioned in the deb sources...

I have updated
/etc/apt/sources.list.d/elementary.list
/etc/apt/sources.list.d/patches.list
/etc/apt/sources.list.d/appcenter.list

and it works. No more nasty popup at the update of elementary os that some sources are wrong

[Vasyl Zaulychny (zaulychny)]

This bug is very bad as it spoils/ruins all work of the Elementary OS team. Impact => Any installed OS just never get updates...

On my opinion, it must be fixed asap. Note, After my manual fix of the files as explained above I got 45 components updated! Surprise, I do apply updates every few days and I never suspect that messages about some "missing PPA" were just about all Elementary OS stuff... I'm new to PPA but now lessons learned.

[Vasyl Zaulychny (zaulychny)]

Issue already solved according to EOS team. See https://github.com/elementary/os/issues/406#issuecomment-720748064