I run Debian 6 64bit on one of my servers. To run the 32bit Pharo/Cog VM, 32bit libraries are needed and are installed thusly:
# apt-get install ia32-libs
Trying out the newly released Ubuntu 14.04, I learn that ia32-libs is considered a hack and was deprecated in 2013 versions of Ubuntu. I guess the idea is to encourage people to know what they require more precisely.
To get the current Pharo-VM-linux-stable.zip to work on Ubuntu 14.04 64bit, install the following packages:
# apt-get lib32gcc1 # apt-get libssl0.9.8:i386
On libssl, that is, OpenSSL, Ubuntu also ships 1.0.1f-1ubuntu2, which patches the Heartbleed bug, so you may install that instead.