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Unfortunately, the Sage 6.10 binary for Ubuntu 15.10 is somehow buggy (more precisely it is built with a version of gcc that is not too old with the respect to library libstdc++.so shipped with Ubuntu 15.10). This is a known problem, which will be solved in Sage 7.0. Meanwhile, a fix is indicated in this post: you have to do

$cd SageMath/local/lib64
$rm libstdc++.so.6
$ln -s /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21 libstdc++.so.6

Then the png viewer will appear.

Unfortunately, the Sage 6.10 binary for Ubuntu 15.10 is somehow buggy (more precisely it is built with a version of gcc that is not too old with the respect to library libstdc++.so shipped with Ubuntu 15.10). This is a known problem, which will be solved in Sage 7.0. Meanwhile, a fix is indicated in this post: you have to dotype the following commands in a terminal (i.e. outside any Sage session)

$cd cd SageMath/local/lib64
$rm rm libstdc++.so.6
$ln ln -s /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21 libstdc++.so.6
/usr/lib/x86_64-linux-gnu/libstdc++.so.6

Then the png viewer will appear. be back at the next Sage session.