2011... Linux has had 64-bit support for what? 15+ years now? And yet you still can't set up a 64-bit OS without quirks.
wget ftp://ftp.cadsoft.de/eagle/program/5.11/eagle-lin-5.11.0.run sudo apt-get install \ lib32asound2 \ lib32gcc1 \ lib32ncurses5 \ lib32stdc++6 \ lib32z1 \ libc6-i386 \ ia32-libs sh ./eagle-lin-5.11.0.run
The error you get when you attempt to install Eagle without installing the ia32 x86 libs are akin to these:
blog comments powered by Disqus Updated at 2011-09-14
eagle-lin-5.6.0.run: 107: /tmp/eagle-setup.0123/eagle-5.6.0/bin/eagle: not found eagle-lin-5.7.0.run: 107: /tmp/eagle-setup.1234/eagle-5.7.0/bin/eagle: not found eagle-lin-5.8.0.run: 107: /tmp/eagle-setup.2345/eagle-5.8.0/bin/eagle: not found eagle-lin-5.9.0.run: 107: /tmp/eagle-setup.3456/eagle-5.9.0/bin/eagle: not found eagle-lin-5.10.0.run: 107: /tmp/eagle-setup.4567/eagle-5.10.0/bin/eagle: not found eagle-lin-5.11.0.run: 107: /tmp/eagle-setup.5678/eagle-5.11.0/bin/eagle: not found