Bug#126450: apt: Puzzling behavior when package binary not available for architecture

[Chris Tillman <tillman@azstarnet.com>]

Package: apt
Version: 0.5.4
Severity: minor

I was trying to install mpsql. I saw it had stable and unstable
versions at packages.debian.org. apt-get returned:

Couldn't find package mpsql

This was puzzling to me, I finally navigated manually to pool/m/mpsql
and found that there was no powerpc version, only i386 and alpha.

This will become a more common occurrence as we continue to add more
architectures, I'd like to suggest a different message when this happens,
such as:

"Package %s unavailable for %s in %s distribution at %s", 
	  "mpsql", "powerpc", "unstable", "mirrors.kernel.org/debian"

-- System Information
Debian Release: 3.0
Architecture: powerpc
Kernel: Linux Obsession 2.2.19 #1 Sat Apr 14 23:20:24 CDT 2001 ppc
Locale: LANG=C, LC_CTYPE=C

Versions of packages apt depends on:
ii  libc6                  2.2.4-5           GNU C Library: Shared libraries an
ii  libstdc++2.10-glibc2.2 1:2.95.4-0.011006 The GNU stdc++ library