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The reason is that the 6.5 was not packaged for 14.10 (utopic), only Sage 6.4.1 is available for this ubuntu release, see the difference between this page for utopic and that page for trusty.

There is some work being currently done on supporting more architectures/releases for Ubuntu.

That say, note that if you already have Sage installed via the PPA, you can update it by only doing:

sudo -E apt-get update
sudo -E apt-get upgrade

So that the package will be updated automatically when a new version appears.

The reason is that the 6.5 was not packaged for 14.10 (utopic), only (utopic) yet, the latest available Sage 6.4.1 is available release for this ubuntu release, release is 6.4.1, see the difference between this page for utopic and that page for trusty.

There is some work being currently done on supporting more architectures/releases for Ubuntu.

That say, note that if you already have Sage installed via the PPA, you can update it by only doing:

sudo -E apt-get update
sudo -E apt-get upgrade

So that the package will be updated automatically when a new version appears.

The reason is that the 6.5 was is not packaged for 14.10 (utopic) yet, the latest available Sage release for this ubuntu release is 6.4.1, see the difference between this page for utopic and that page for trusty.

There is some work being currently done on supporting more architectures/releases for Ubuntu.

That say, note that if you already have Sage installed via the PPA, you can update it by only doing:

sudo -E apt-get update
sudo -E apt-get upgrade

So that the package will be updated automatically when a new version appears.