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From: Fabian peter Hammerle <Fabianpeter.Hammerle@catalysts.cc>
Newsgroups: linux.debian.user
Subject: apt-get install refuses to installs older versions of dependencies
Date: Mon, 01 Jul 2019 09:40:02 +0200
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Xref: csiph.com linux.debian.user:210517

Dear Debian Users,

I set up an=A0APT repository containing 2 packages: foo and bar

The repository contains 2 versions of foo: 1.0.0 and 2.0.0
and 2 versions of bar: 3.0.0 and 4.0.0

foo 1.0.0 depends on bar 3.0.0
foo 2.0.0 depends on bar 4.0.0

I can easily install the latest version of foo via
```
$ sudo apt-get install foo
[...]
The following NEW packages will be installed:
=A0 foo bar
[...]
Setting up bar (4.0.0) ...
Setting up foo (2.0.0) ... ```

I get the same result when running `sudo apt-get install foo=3D2.0.0`

However, apt-get fails to install foo 1.0.0
```
$ sudo apt-get install foo=3D1.0.0
Reading package lists... Done
Building dependency tree=A0 =A0 =A0 =A0
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
=A0foo=A0: Depends: bar (=3D 3.0.0) but 4.0.0 is to be installed
E: Unable to correct problems, you have held broken packages. ```

Currently, I workaround this issue by running `sudo apt-get install foo=3D1=
.0.0 bar=3D3.0.0`.

How can I instruct apt-get to automatically install an older version of bar=
 as required by foo?

Or in other words: How can I make `apt-get install foo=3D1.0.0` install bot=
h foo 1.0.0 and bar 3.0.0 (dependency of foo 1.0.0).

Thanks,
Fabian

     =