sage/matrix/matrix_mpolynomial_dense.so
that's who. In this case it hasn't been rebuild after nt.'s upgrade, and 
Jean-Pierre 
is probably right except that this ticket is in beta8 (I think). You probably 
need a bit
of make distclean && make

François

On 17/04/2014, at 22:54, John Cremona <[email protected]> wrote:

> This is a different problem to the one I reported on the other
> sage-release thread.  On my laptop (ubuntu 12.04) I had a working
> build of a previous beta, I think beta6.  I pulled from trac/develop
> and ran a make.  Here's the error message:
> 
> 
> [ -f local/etc/sage-started.txt ] || local/bin/sage-starts
> build/pipestatus "./sage --docbuild --no-pdf-links all html  2>&1"
> "tee -a logs/dochtml.log"
> Traceback (most recent call last):
>  File "/home/john/sagegit/src/doc/common/builder.py", line 1467, in <module>
>    import sage.all
> (...)
>  File 
> "/home/john/sagegit/local/lib/python2.7/site-packages/sage/matrix/matrix_space.py",
> line 48, in <module>
>    import matrix_mpolynomial_dense
> ImportError: libntl.so.2: cannot open shared object file: No such file
> or directory
> 
> Looking into local/lib I find
> 
> $ ls -l local/lib/*ntl*
> -rw-r--r-- 1 john john 15502216 Apr 17 10:37 local/lib/libntl.a
> -rw------- 1 john john     1047 Apr 17 11:34 local/lib/libntl.la
> lrwxrwxrwx 1 john john       15 Apr 17 10:37 local/lib/libntl.so ->
> libntl.so.3.0.0
> lrwxrwxrwx 1 john john       15 Apr 17 10:37 local/lib/libntl.so.3 ->
> libntl.so.3.0.0
> -rwx------ 1 john john  9174875 Apr 17 10:37 local/lib/libntl.so.3.0.0
> 
> but somebody was trying to open libntl.so.2 (not 3).  Who?
> 
> John
> 
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