On Nov 20, 2009, at 8:59 AM, Jorge E. ´Sanchez Sanchez wrote:

> Thank you very much Robert,
>
>    I recently upgrade my Ubuntu 9.04 to 9.10 and because I have no  
> problems with my binary Sage Version 4.1, Release Date: 2009-07-09  
> installation I thought I could stay with it, (last time I upgrade  
> sage I had too many problems with other spkg's I had working, which  
> I need to rebuilt -process which took me more time I am able to  
> spend now- so I am a little affraid to make this new upgrade,  
> although I know it deserves the pain).
>
>    I have just tried the import zlib, within sage shell and got:
>
>     /usr/bin/python: /opt/sage/local/lib/libz.so.1: no version  
> information available (required by /usr/bin/python)
>    Traceback (most recent call last):
>      File "/usr/lib/command-not-found", line 8, in <module>
>        import CommandNotFound
>    ImportError: No module named CommandNotFound
>
> so there must be a compatibility problem with my 4.1sage binary  
> installation and the upgrade to Ubuntu 9.10,
> what would you recommend me in my circumstances.

Yep, that's what it looks like...

What I would do is build the latest Sage from source. It may take a  
couple of hours, but you can do that in the background while you work  
on something else, or while you're sleeping. Given the binary  
incompatibility, and that you've had issues before, I wouldn't just - 
upgrade. Note that you can install the new sage parallel to the one  
you have so you don't have to disrupt your current installation  
(though you won't be able to have the notebook open in each unless you  
make sure they're in different folders and on different ports. To be  
safe, you could just avoid opening the notebook in the new sage until  
you're ready to switch over, as it will attempt to update the storage  
format because of architectural changes in sage 4.1.2). This way you  
can get Cython to work (I hope) and make sure all your other stuff  
works fine too before switching over.

- Robert

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