Hello,
look at this page:
http://pharo.org/gnu-linux-installation
and try to download "libc < 2.15" or "centos" versions.
Both are broken - error message immediately after start:
"This interpreter (vers. 6505) cannot read image file (vers. 6521)."
So, the first impression is really terrible (don't work at all).
Default GNU/Linux download is probably OK.
pf