$ sudo apt-get install libncursesw5-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  libncursesw5-dev
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 512kB of archives.
After this operation, 1757kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  libncursesw5-dev
Install these packages without verification [y/N]? y
Err http://us.archive.ubuntu.com jaunty/main libncursesw5-dev 5.7+20090207-1ubuntu1
  404 Not Found [IP: 91.189.88.45 80]
Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/n/ncurses/libncursesw5-dev_5.7+20090207-1ubuntu1_amd64.deb  404 Not Found [IP: 91.189.88.45 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missin