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sudo apt-get install gitk

Reading package lists... Done

Building dependency tree      

Reading state information... Done

The following packages were automatically installed and are no longer required:

  linux-headers-3.2.0-24 linux-headers-3.2.0-24-generic

  linux-headers-3.2.0-24-generic-pae

Use 'apt-get autoremove' to remove them.

The following extra packages will be installed:

  tcl tk

Suggested packages:

  git-doc

The following NEW packages will be installed:

  gitk tcl tk

0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.

Need to get 143 kB of archives.

After this operation, 1,199 kB of additional disk space will be used.

Do you want to continue [Y/n]? y

WARNING: The following packages cannot be authenticated!

  tcl tk gitk

Install these packages without verification [y/N]? y

Err http://archive.ubuntu.com/ubuntu/ precise/main tcl all 8.5.0-2

  Could not connect to 192.168.128.1:8080 (192.168.128.1). - connect (110: Connection timed out)

Err http://archive.ubuntu.com/ubuntu/ precise/main tk all 8.5.0-2

  Unable to connect to 192.168.128.1:8080:

Err http://archive.ubuntu.com/ubuntu/ precise/main gitk all 1:1.7.9.5-1

  Unable to connect to 192.168.128.1:8080:

Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/t/tcltk-defaults/tcl_8.5.0-2_all.deb  Could not connect to 192.168.128.1:8080 (192.168.128.1). - connect (110: Connection timed out)

Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/t/tcltk-defaults/tk_8.5.0-2_all.deb  Unable to connect to 192.168.128.1:8080:

Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/g/git/gitk_1.7.9.5-1_all.deb  Unable to connect to 192.168.128.1:8080:

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?