snapshot.debian.net rocks

Today during upgrade I got the gnome packages broken:

$ wajig install nautilus
Reading package lists... Done
Building dependency tree       
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.

Since you only requested a single operation it is extremely likely that
the package is simply not installable and a bug report against
that package should be filed.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  nautilus: Depends: libexempi2 but it is not installable
E: Broken packages
$

I tried to download the source package of libexempi2, no luck (doesn't exist). Then I remembered I've heard about snapshot.debian.net, so I tried that and added:

deb http://snapshot.debian.net/archive pool exempi

to my /etc/apt/sources.list and voilà - it works!

$ wajig install nautilus
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libstdc++5 libpixman-1-0 libglut3 libsqlite0 lib64gfortran2 libqt4-sql
  libntfs-3g4 libkdcraw1
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  fam libexempi2 libtrackerclient0 nautilus-cd-burner
Suggested packages:
  tracker
The following NEW packages will be installed:
  fam libexempi2 libtrackerclient0 nautilus nautilus-cd-burner
0 upgraded, 5 newly installed, 0 to remove and 46 not upgraded.
Need to get 1583kB of archives.
After unpacking 5632kB of additional disk space will be used.
Do you want to continue [Y/n]? 
WARNING: The following packages cannot be authenticated!
  libexempi2
Install these packages without verification [y/N]? y
Get:1 http://ftp.cz.debian.org sid/main fam 2.7.0-13 [69.0kB]
Get:2 http://ftp.cz.debian.org sid/main libtrackerclient0 0.6.3-3 [41.3kB]
Get:3 http://ftp.cz.debian.org sid/main nautilus 2.20.0-1 [639kB]              
Get:4 http://snapshot.debian.net pool/exempi libexempi2 1.99.4-1 [290kB]
Get:5 http://ftp.cz.debian.org sid/main nautilus-cd-burner 2.20.0-1 [544kB]
Fetched 1583kB in 7s (199kB/s)                                                 
Selecting previously deselected package fam.
(Reading database ... 210515 files and directories currently installed.)
Unpacking fam (from .../archives/fam_2.7.0-13_i386.deb) ...
Selecting previously deselected package libexempi2.
Unpacking libexempi2 (from .../libexempi2_1.99.4-1_i386.deb) ...
Selecting previously deselected package libtrackerclient0.
Unpacking libtrackerclient0 (from .../libtrackerclient0_0.6.3-3_i386.deb) ...
Selecting previously deselected package nautilus.
Unpacking nautilus (from .../nautilus_2.20.0-1_i386.deb) ...
dpkg: warning - unable to delete old directory `/usr/share/mime/application': Directory not empty
Selecting previously deselected package nautilus-cd-burner.
Unpacking nautilus-cd-burner (from .../nautilus-cd-burner_2.20.0-1_i386.deb) ...
Setting up fam (2.7.0-13) ...
Starting file alteration monitor: FAM.
Setting up libexempi2 (1.99.4-1) ...
Setting up libtrackerclient0 (0.6.3-3) ...
Setting up nautilus (2.20.0-1) ...
Setting up nautilus-cd-burner (2.20.0-1) ...