If you try (in Sage-8.2)
sage: x = polygen(QQ)
sage: f = x^12-2
sage: f.galois_group()
you will see the message
NotImplementedError: the package 'kash' was not found. You can install it
by running 'sage -i kash' in a shell
Sorry, computation of Galois groups of fields of degree bigger than 11 is
not yet implemented. Try installing the optional free (closed source) KASH
package, which supports degrees up to 21, or use algorithm='magma' if you
have magma.
Now, 'sage -i kash' tells you
Error: package 'kash' not found
Note: if it is an old-style package, use -p instead of -i to install it
However, 'sage -p kash' gives
Attempting to download package kash
>>> Checking online list of optional packages.
ERROR [transfer|run:135]: [Errno 404] Not Found: '//
www.mirrorservice.org/sites/www.sagemath.org//spkg/optional/list'
sed: can't read /home/jec/.sage//optional.list: No such file or directory
>>> Checking online list of experimental packages.
ERROR [transfer|run:135]: [Errno 404] Not Found: '//
www.mirrorservice.org/sites/www.sagemath.org//spkg/experimental/list'
sed: can't read /home/jec/.sage//experimental.list: No such file or
directory
>>> Checking online list of huge packages.
ERROR [transfer|run:135]: [Errno 404] Not Found: '//
www.mirrorservice.org/sites/www.sagemath.org//spkg/huge/list'
sed: can't read /home/jec/.sage//huge.list: No such file or directory
Error: could not find a package matching kash
Try 'sage --package list' to see the available packages
Did you mean: yasm, arb, flask, gap, gap3?
so it seems that the kash package has disappeared. In which case the
original error message is not so helpful unless you have Magma:
sage: f.galois_group(algorithm='magma')
Transitive group number 28 of degree 12
John
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