Comment 1 for bug 816153

As reported by Alejandro, this works as a workaround:

sudo rm /usr/lib/x86_64-linux-gnu/libc.so
sudo ln -sf /lib/x86_64-linux-gnu/libc-2.13.so /usr/lib/x86_64-linux-gnu/libc.so

$ uname -a
Linux squeezepro 2.6.38-10-server #46-Ubuntu SMP Tue Jun 28 16:31:00 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

$ lsb_release -rd
Description: Ubuntu 11.04
Release: 11.04

$ apt-cache policy dante-server
dante-server:
  Installed: 1.1.19.dfsg-3ubuntu4.1
  Candidate: 1.1.19.dfsg-3ubuntu4.1
  Version table:
 *** 1.1.19.dfsg-3ubuntu4.1 0
        500 http://be.archive.ubuntu.com/ubuntu/ natty-updates/universe amd64 Packages
        100 /var/lib/dpkg/status
     1.1.19.dfsg-3ubuntu4 0
        500 http://be.archive.ubuntu.com/ubuntu/ natty/universe amd64 Packages