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Hi,

Unfortunately, due to some change in the SageMath PPA (Sage sources are no longer shipped with the Ubuntu package), it is no longer possible to install SageManifolds in this way, because SageManifolds needs Sage sources to be build, cf. this discussion.

So for the time being, if you want to install SageManifolds, install first Sage in your home directory (not system-wide!) from a Linux binary that you can download from here (do not select the PPA method). Then follow these instructions.