Getting "E: The repository '... Release' does not have a Release file." error message when installing package on Termux

Question

I've tried installing numerous different packages on Termux but keep getting roughly the same error: E: Unable to locate package

$ pkg install iwyu
Checking availability of current mirror: ok
Ign:1 dl.bintray.com/grimler/game-packages-24 games InRelease
Ign:2 dl.bintray.com/grimler/science-packages-24 science InRelease
Ign:3 main.termux-mirror.ml stable InRelease
Err:4 dl.bintray.com/grimler/game-packages-24 games Release
  404 Not Found
Err:5 dl.bintray.com/grimler/science-packages-24 science Release
  404 Not Found
Err:6 main.termux-mirror.ml stable Release
  Redirection from https to 'ww38.main.termux-mirror.ml/dists/stable/Release' is forbidden
Reading package lists... Done
E: The repository 'dl.bintray.com/grimler/game-packages-24 games Release' does not have a Release file.
N: Metadata integrity can't be verified, repository is disabled now.
N: Possible cause: repository is under maintenance or down (wrong sources.list URL?).
E: The repository 'dl.bintray.com/grimler/science-packages-24 science Release' does not have a Release file. 
N: Metadata integrity can't be verified, repository is disabled now. N: Possible cause: repository is under maintenance or down (wrong sources.list URL?).
E: The repository 'main.termux-mirror.ml stable Release' does not have a Release file.
N: Metadata integrity can't be verified, repository is disabled now.
N: Possible cause: repository is under maintenance or down (wrong sources.list URL?).
$

Solutions?

Software details:

• Samsung Galaxy S20
• Android 13

Answer 1

Checking all the repository links, looks like all of them are already down:

• Bintray repo has officially shut down since May 2021
• termux-mirror.ml redirects to suspicious pages

The issue has been known and documented on the Termux' GitHub issue, Issue #6726 - [README] Bintray repository hosting shut down | Error 403 Forbidden | Error 404. The gist is to change the repo sources, either by using termux-change-repo or by editing sources.list file.

What you should do as Termux user (only for Android 7+)

---

You need to pick a one of the available mirrors by using utility termux-change-repo or manually edit sources.list by replacing the Bintray URL with value obtained from Termux Mirrors List.

Beware of third-party scripts claiming theirselves as repository fixers! They could install untrusted GPG key and redirect your Termux installation onto malicious repository. Official tool for changing repositories is bundled within Termux and called termux-change-repo.

Usage of termux-change-repo is simple:

1. Select one or more repositories for which you want to change mirror by tapping "space" and navigating over list by up/down arrow keys. Tap enter to confirm the choice.
2. Pick a mirror, it is recommended to begin with mirror hosted by Grimler. Same as previously, navigate over list by arrow keys, pick mirror by space key and confirm choice by pressing "enter".

Highly recommended to run pkg upgrade after changing mirror.

If you get E: Repository .. changed its .. value from .. to ..

Package manager can show you a notification with prompt which look like this one:

E: Repository 'https://grimler.se/termux-root-packages-24 root InRelease' changed its 'Origin' value from 'Bintray' to 'termux-root-packages-24 root'
E: Repository 'https://grimler.se/termux-root-packages-24 root InRelease' changed its 'Label' value from 'Bintray' to 'termux-root-packages-24 root'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
Do you want to accept these changes and continue updating from this repository? [y/N] 

It is completely normal. Answer "yes" to this prompt. It will be shown only once per repository, so package manager will ask you to confirm for game-repo, science-repo, etc separately but you will need to confirm them only one time.