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Hi experts!

I remove .sage/ folder, then remove /usr/lib/sagemath and reinstall SAGE. The porblem is not fixed!!

The crash file shows:

NU gdb (GDB)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Para las instrucciones de informe de errores, vea:

Stack backtrace

Cython backtrace
Exception:  <class 'gdb.error'> No hay registros.

Could not attach to process.  If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user.  For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Operación no permitida.
No stack.
Traceback (most recent call last):
  File "<string>", line 118, in <module>
  File "<string>", line 90, in invoke
  File "<string>", line 94, in newest_first_order
error: No hay registros.
aviso: Inferior ID 1 has no threads.
close failed in file object destructor:
IOError: [Errno 9] Descriptor de archivo erróneo

What can I do?

Please help