All gnome extensions outdated

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http://askubuntu.com – I installed Gnome 3 on Ubuntu today following this guide. All worked well and I installed the extensions mentioned without problem. However, after logging out and in, all extensions were gone. Going to the Gnome extensions website, I saw that all my extensions were outdated and that I could install only one other extension. I'm rather new to Ubuntu and completely new to Gnome. I don't even know how to check my own version (there's no mention of Gnome in System Information) - I reasoned maybe I'm using an outdated version, even though apt-get update/upgrade/dist-upgrade does not upgrade anyth (HowTos)