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
