cannot execute code in cell in Jupyter notebook VM

Iam unable to excute any code in the cell in Jupyter notebook VM, it shows an asterix sign next to cell, disabling firewall did not help

Please help

Thanks

Start by reproducing the problem in the Jupyter notebook VM and inspect the kernel status while a cell remains busy. The issue provides no environment details, logs, or named files, so gather those first; done means identifying why execution is blocked and confirming that a cell runs successfully.

Written by the indexing model from the issue text.