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Hi again, this bug was marked as fixed in version 8.6, but I still encounter it in this same version :

Forcing sage-location, probably because a new package was installed.
Cleaning up, do not interrupt this.
Done cleaning.
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 8.6, Release Date: 2019-01-15                     │
│ Using Python 2.7.15. Type "help()" for help.                       │
└────────────────────────────────────────────────────────────────────┘
sage: a = vector([E(8)])
sage: a.norm()
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-2-5b5ddb3f4c99> in <module>()
----> 1 a.norm()

/home/henri/SageMath/local/lib/python2.7/site-packages/sage/modules/free_module_element.pyx in sage.modules.free_module_element.FreeModuleElement.norm (build/cythonized/sage/modules/free_module_element.c:12190)()
   1672             sqrt(5)
   1673         """
-> 1674         abs_self = [abs(x) for x in self]
   1675         if p == Infinity:
   1676             return max(abs_self)

TypeError: bad operand type for abs(): 'UniversalCyclotomicField_with_category.element_class'

Am I doing something wrong ?