Jupyter notebook cell stays busy (*) even after the execution is complete
问题 The Jupyter/IPython notebook started acting a little strange for my Ubuntu (14.04) computer. Usually, a cell in jupyter notebook becomes busy with an asterisk (*) symbol next to it when it is executed and as soon as the execution is busy, the execution sequence number is displayed to denote successful completion of whatever task which was in it. Now, whenever I execute a cell, it remains busy with an asterisk next to it even after the execution is complete. Then, any other cell which is given