This might be something crashed, or it might just be the screen failing to turn back on.
First please check for crashes using these steps: https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment
Next time you experience the black screen please:
1. Wait 10 seconds.
2. Reboot.
3. Run:
journalctl -b-1 > prevboot.txt
4. Attach the resulting text file here.
This might be something crashed, or it might just be the screen failing to turn back on.
First please check for crashes using these steps: https:/ /wiki.ubuntu. com/Bugs/ Responses# Missing_ a_crash_ report_ or_having_ a_.crash_ attachment
Next time you experience the black screen please:
1. Wait 10 seconds.
2. Reboot.
3. Run:
journalctl -b-1 > prevboot.txt
4. Attach the resulting text file here.