Get:100 http://us.archive.ubuntu.com/ubuntu/ natty/main texlive-latex-base-doc all 2009-11 [40.7 MB]
Get:101 http://us.archive.ubuntu.com/ubuntu/ natty/main texlive-latex-extra-doc all 2009-10ubuntu1 [190 MB]
Get:102 http://us.archive.ubuntu.com/ubuntu/ natty/main texlive-latex-recommended-doc all 2009-11 [15.4 MB]
Get:103 http://us.archive.ubuntu.com/ubuntu/ natty/main texlive-luatex all 2009-11 [985 kB]
Get:104 http://us.archive.ubuntu.com/ubuntu/ natty/main texlive-pictures-doc all 2009-11 [11.9 MB]
Get:105 http://us.archive.ubuntu.com/ubuntu/ natty/main texlive-pstricks-doc all 2009-10ubuntu1 [57.6 MB]
Err http://us.archive.ubuntu.com/ubuntu/ natty-security/main libpng12-0 amd64 1.2.44-1ubuntu3.3
  404  Not Found [IP: 91.189.92.183 80]
Err http://us.archive.ubuntu.com/ubuntu/ natty-security/main libpng12-dev amd64 1.2.44-1ubuntu3.3
  404  Not Found [IP: 91.189.92.183 80]
Fetched 517 MB in 1h 56min 14s (74.1 kB/s)
Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-0_1.2.44-1ubuntu3.3_amd64.deb  404  Not Found [IP: 91.189.92.183 80]
Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-dev_1.2.44-1ubuntu3.3_amd64.deb  404  Not Found [IP: 91.189.92.183 80]
Unable to correct missing packages.
E: Aborting install.
Failed to find just-installed command 'cmake' after pre-requisite installation.
This very likely indicates that the pre-requisite installation failed
to install one or more critical pre-requisites for Gnu Radio/UHD
osiris@osiris-laptop:~/Downloads/gnuradio$