[throwaway2056]

Which (reputed) university will allow for a sysadmin to tell students that they need to purchase Ubuntu to attend a course? Seriously, the sysadmin will get fired (at the least). Given costs of education (at least US) asking someone to buy RHEL for about $300 would be PITA (for poor students). Most sysadmins are invisible. And at our University we have about 100 Debian servers. Do you mean if we move them to Ubuntu (I personally) buy so many licenses? Are you working for Canonical?

Both sides should calm down. It is OK to criticise Ubuntu/Debian/RHEL. A restaurant critic does not have a restaurant. CKS anyway says he/they will move to Debian.