満たされていないacroreadの依存関係によりSynapticのインストールが妨げられる

Synaptic でエラーが発生します。

acroread: 
  Depends: acroread-l10n-en but it is not going to be installed or acroread-l10n 
  Depends: acroread-debian-files but it is not going to be installed 
  Depends: acroread-data but it is not going to be installed 
  Depends: ia32-libs-xulrunner but it is not going to be installed 

Synapticは一般的に依存関係を自動的に解決するので、これは私にとってまれです。 acroreadは非常に人気のあるパッケージです。

この問題を解決する方法を知りたいです。

私はDeb 6 64ビットを使用しています。

から派生したacroread deb http://www.debian-multimedia.org squeeze main non-free。

可能な関連情報については、以下を参照してください。ストレージのソースに対するセキュリティバリアの有効化。

編集（@enzotib）：

# Debian packages for stable
deb http://mirror.transact.net.au/debian/ stable main contrib non-free
# Uncomment the deb-src line if you want 'apt-get source'
# to work with most packages.
# deb-src http://mirror.transact.net.au/debian/ stable main contrib non-free

# Security updates for stable
# deb http://security.debian.org/ stable/updates main contrib non-free

deb http://www.debian-multimedia.org squeeze main non-free
#contains Adobe Reader

@ギルス

peter@peter-deb:~$ apt-cache policy acroread acroread-debian-files ia32-libs-xulrunner
acroread-debian-files:
  Installed: (none)
  Candidate: 9.4.2
  Version table:
     9.4.2 0
        500 http://www.debian-multimedia.org/ squeeze/main amd64 Packages
acroread:
  Installed: (none)
  Candidate: 9.4.2-0.0
  Version table:
     9.4.2-0.0 0
        500 http://www.debian-multimedia.org/ squeeze/non-free amd64 Packages
ia32-libs-xulrunner:
  Installed: (none)
  Candidate: 1.8.1.3-0.5
  Version table:
     1.8.1.3-0.5 0
        500 http://www.debian-multimedia.org/ squeeze/main amd64 Packages

@ギルス：

peter@peter-deb:~$ sudo aptitude install acroread
The following NEW packages will be installed:
  acroread acroread-data{a} acroread-debian-files{a} 
  acroread-dictionary-en{a} acroread-l10n-en{a} ia32-libs{a} 
  ia32-libs-gtk{a} ia32-libs-xulrunner{a} lib32asound2{ab} lib32bz2-1.0{a} 
  lib32gcc1{a} lib32ncurses5{a} lib32stdc++6{a} lib32v4l-0{a} lib32z1{a} 
  libc6-i386{a} 
0 packages upgraded, 16 newly installed, 0 to remove and 8 not upgraded.
Need to get 4,955 kB/102 MB of archives. After unpacking 254 MB will be used.
The following packages have unmet dependencies:
  lib32asound2: Depends: libasound2 (= 1.0.23-2.1) but 1.0.24.1-2 is installed.
The following actions will resolve these dependencies:

     Keep the following packages at their current version:
1)     acroread [Not Installed]                           
2)     acroread-data [Not Installed]                      
3)     acroread-debian-files [Not Installed]              
4)     acroread-dictionary-en [Not Installed]             
5)     acroread-l10n-en [Not Installed]                   
6)     ia32-libs [Not Installed]                          
7)     ia32-libs-gtk [Not Installed]                      
8)     ia32-libs-xulrunner [Not Installed]                
9)     lib32asound2 [Not Installed]                       



Accept this solution? [Y/n/q/?] Y
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 8 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.

追加のエラーメッセージ：

E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
E: Unable to correct dependencies
E: Unable to lock the download directory