Updating to 5.4 from Ubuntu PPA

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Hello, This morning, I had updated Sage to the recent version 5.4 from the Ubuntu PPA. The installation crashed but later I fixed with little help from the transcript of the Sage-Support mailing list to the following stage:

• Sage runs with sudo permissions but not otherwise.
• Without sudo privilege, the crash report is here.

The error I get is a name error: sage_prompt is not defined and a couple of inaccessible directories (I think the OS module is trying to access some directories which require sudo permissions.) There is also a warning: a config file is not getting created...

Hope someone can help me fix this.