$ sudo apt-get install x11vnc
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
tcl tcl-lib tcl8.5 tcl8.5-lib tk tk-lib tk8.5 tk8.5-lib x11vnc-data
Suggested packages:
tcl-tclreadline
The following NEW packages will be installed:
tcl tcl-lib tcl8.5 tcl8.5-lib tk tk-lib tk8.5 tk8.5-lib x11vnc x11vnc-data
0 upgraded, 10 newly installed, 0 to remove and 285 not upgraded.
Need to get 2.130 kB/3.675 kB of archives.
After this operation, 9.615 kB of additional disk space will be used.
Do you want to continue [Y/n]? Y
WARNING: The following packages cannot be authenticated!
tcl8.5-lib tk8.5-lib tcl8.5 tcl-lib tcl tk8.5 tk-lib tk x11vnc-data x11vnc
Install these packages without verification [y/N]? y
Err http://be.archive.ubuntu.com/ubuntu/ saucy/main tcl8.5-lib amd64 8.5.13-1ubuntu4
404 Not Found [IP: 91.189.88.162 80]
Err http://be.archive.ubuntu.com/ubuntu/ saucy/main tk8.5-lib amd64 8.5.11-2ubuntu4
404 Not Found [IP: 91.189.88.162 80]
Err http://be.archive.ubuntu.com/ubuntu/ saucy/main tcl8.5 amd64 8.5.13-1ubuntu4
404 Not Found [IP: 91.189.88.162 80]
Err http://be.archive.ubuntu.com/ubuntu/ saucy/main tcl-lib amd64 8.5.0-2ubuntu5
404 Not Found [IP: 91.189.88.162 80]
Err http://be.archive.ubuntu.com/ubuntu/ saucy/main tcl amd64 8.5.0-2ubuntu5
404 Not Found [IP: 91.189.88.162 80]
Err http://be.archive.ubuntu.com/ubuntu/ saucy/main tk8.5 amd64 8.5.11-2ubuntu4
404 Not Found [IP: 91.189.88.162 80]
Err http://be.archive.ubuntu.com/ubuntu/ saucy/main tk-lib amd64 8.5.0-2ubuntu5
404 Not Found [IP: 91.189.88.162 80]
Err http://be.archive.ubuntu.com/ubuntu/ saucy/main tk amd64 8.5.0-2ubuntu5
404 Not Found [IP: 91.189.88.162 80]
Failed to fetch http://be.archive.ubuntu.com/ubuntu/pool/main/t/tcl8.5/tcl8.5-lib_8.5.13-1ubuntu4_amd64.deb 404 Not Found [IP: 91.189.88.162 80]
Failed to fetch http://be.archive.ubuntu.com/ubuntu/pool/main/t/tk8.5/tk8.5-lib_8.5.11-2ubuntu4_amd64.deb 404 Not Found [IP: 91.189.88.162 80]
Failed to fetch http://be.archive.ubuntu.com/ubuntu/pool/main/t/tcl8.5/tcl8.5_8.5.13-1ubuntu4_amd64.deb 404 Not Found [IP: 91.189.88.162 80]
Failed to fetch http://be.archive.ubuntu.com/ubuntu/pool/main/t/tcltk-defaults/tcl-lib_8.5.0-2ubuntu5_amd64.deb 404 Not Found [IP: 91.189.88.162 80]
Failed to fetch http://be.archive.ubuntu.com/ubuntu/pool/main/t/tcltk-defaults/tcl_8.5.0-2ubuntu5_amd64.deb 404 Not Found [IP: 91.189.88.162 80]
Failed to fetch http://be.archive.ubuntu.com/ubuntu/pool/main/t/tk8.5/tk8.5_8.5.11-2ubuntu4_amd64.deb 404 Not Found [IP: 91.189.88.162 80]
Failed to fetch http://be.archive.ubuntu.com/ubuntu/pool/main/t/tcltk-defaults/tk-lib_8.5.0-2ubuntu5_amd64.deb 404 Not Found [IP: 91.189.88.162 80]
Failed to fetch http://be.archive.ubuntu.com/ubuntu/pool/main/t/tcltk-defaults/tk_8.5.0-2ubuntu5_amd64.deb 404 Not Found [IP: 91.189.88.162 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?