last spring I compiled sagemath on 2 machines, 1 with debian testing, 1 debian Sid.
Both worked. Now none of them works anymore, even if trying to launch exactly the same way (from xterm):
Traceback (most recent call last): File "/home/lambada/MonSAGE__10_3/sage/src/bin/sage-ipython", line 9, in <module> from sage.misc.banner import banner
ModuleNotFoundError: No module named 'sage'
Something modified by updates-upgrades??