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weight orders

I found that installed Sage on my VM Ubuntu can't create weighted TermOrders. Using 'Force = True' results in a ring with just lex order. Reinstalling doesn't help.

Copying from http://sagemath.org/doc/reference/sage/rings/polynomial/term_order.html?highlight=termorder#sage.rings.polynomial.term_order.TermOrder results in Error massage: "verbose 0 (388: term_order.py, __init__) Term ordering 'wdegrevlex' unknown"

how can i fix that problem?

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weight orders

I found that installed Sage on my VM Ubuntu can't create weighted TermOrders. Using 'Force = True' results in a ring with just lex order. Reinstalling doesn't help.

Copying from http://sagemath.org/doc/reference/sage/rings/polynomial/term_order.html?highlight=termorder#sage.rings.polynomial.term_order.TermOrder results in Error massage: "verbose 0 (388: term_order.py, __init__) Term ordering 'wdegrevlex' unknown"

how can i fix that problem?