Quote:
Originally Posted by bowlins
[SOLVED]
I now found why! I installed Calibre via Ubuntu Software Centre. For some reason only 1.25 is available there.
I've followed instructions at http://calibre-ebook.com/download_linux and now I have the latest version.
Thanks a lot for that. I was going mental as I remembered customising the toolbar in Windows
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Many linux distros lag in updating packages, Ubuntu is often locked into whichever version of something was available when the
Ubuntu version was released. You'd be even more behind in Ubuntu 12.04 LTS

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I use Arch Linux, which is bleeding edge and rolling-release. Makes things more exciting, but things are always updated.
You may be interested in the following guide.
Sticky:
Fully automatic calibre installer/updater for linux