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?