Webb-apps preview deosn't work. Doesn't upgrade. Doesnt uninstall

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http://askubuntu.com – Trying to remove web apps preview like this: [code]sudo apt-get remove gnome-control-center-signon signond signon-keyring-extension signon-plugin-oauth2 signon-ui libunity-webapps-chromium unity-chromium-extension unity-lens-gdocs unity-lens-photo unity-scope-flickr xul-ext-webaccounts xul-ext-unity xul-ext-websites-integration[/code] And I get this: [code]Virtual packages like 'xul-ext-unity' can't be removed E: Unable to locate package xul-ext-webaccounts[/code] It's on my system but if I run: [code]sudo apt-get install unity-webapps-preview[/code] I get: [code]Reading package lists... Do (HowTos)