PMA-05-013:~# apt-get update
Hit http://security.debian.org testing/updates/main Packages
Hit http://security.debian.org testing/updates/main Release
Get:1 http://ftp.kulnet.kuleuven.ac.be testing/main Packages [5672kB]
Hit http://download.skype.com stable/non-free Packages
Hit http://download.skype.com stable/non-free Release
Get:2 http://ftp.kulnet.kuleuven.ac.be testing/main Release [81B]
Get:3 http://ftp.kulnet.kuleuven.ac.be testing/main Sources [1664kB]
Get:4 http://ftp.kulnet.kuleuven.ac.be testing/main Release [83B]
Get:5 http://ftp.kulnet.kuleuven.ac.be testing/main Packages [5672kB]
Get:6 http://ftp.kulnet.kuleuven.ac.be testing/main Release [81B]
Get:7 http://ftp.kulnet.kuleuven.ac.be testing/contrib Packages [70.0kB]
Get:8 http://ftp.kulnet.kuleuven.ac.be testing/contrib Release [84B]
Get:9 http://ftp.kulnet.kuleuven.ac.be testing/non-free Packages [103kB]
Get:10 http://ftp.kulnet.kuleuven.ac.be testing/non-free Release [85B]
99% [5 Packages gzip 0]
gzip: stdin: Resource temporarily unavailable
Err http://ftp.kulnet.kuleuven.ac.be testing/main Packages
  Could not open file /var/lib/apt/lists/partial/ftp.kulnet.kuleuven.ac.be_debian_dists_testing_main_binary-i386_Packages - open (2 No such file or directory)
Fetched 7510kB in 2s (3677kB/s)
Failed to fetch http://ftp.kulnet.kuleuven.ac.be/debian/dists/testing/main/binary-i386/Packages.gz  Could not open file /var/lib/apt/lists/partial/ftp.kulnet.kuleuven.ac.be_debian_dists_testing_main_binary-i386_Packages - open (2 No such file or directory)
Reading Package Lists... Done
W: Duplicate sources.list entry http://ftp.kulnet.kuleuven.ac.be testing/main Packages (/var/lib/apt/lists/ftp.kulnet.kuleuven.ac.be_debian_dists_testing_main_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems
E: Some index files failed to download, they have been ignored, or old ones used instead.