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I am not sure about your actual problem since i am not running ubuntu 18.10, so that i can not reproduct.
That said, i would recommend to switch to the jupyter notebook, not only because it will fix your problem, but also since the Sage notebook is deprecated for a while and gets updated only to fix critical issues.
On the jupyter notebook, to remove a cell, just go into the command mode by typing on the ESC key (the left of the cell becomes blue), and then type x to remove the current cell.
| | 2 | No.2 Revision |
I am not sure about your actual problem since i am not running ubuntu 18.10, so that i can not reproduct.reproduce your problem.
That said, i would strongly recommend to switch to the jupyter notebook, not only because it will fix your problem, but also since the Sage notebook is deprecated for a while and gets updated only to fix critical issues.
On the jupyter notebook, to remove a cell, just go into the command mode by typing on the ESC key (the left of the cell becomes blue), and then type x to remove the current cell.
