I have been using Xubuntu 16.04 for a long time now (Xubuntu for 4 years). My system is a dual boot with Windows 10, but I never use Windows.
Since the last two days my laptop, Asus Zenbook UX305, has been shutting down unexpectedly. The following is the sequence of events. (1) An unexpected shutdown, mostly while I am browsing the net using firefox. (2) To restart, I have to plug in the power chord, without which it does not restart. (3) When I do restart, it takes me to Windows 10. The fast boot option, which had been disabled, gets enabled on its own, and the boot sequence changes to give priority to Windows over Ubuntu. (4) After restart I have to Login to Windows, go to UEFI settings, disable Fast boot, change the boot sequence to give priority to Ubuntu over Windows. (5) Now when I switch on the machine, I see the grub screen as usual, and then boot into Ubuntu again and things work normally. (6) I need to change the date because the date gets messed up due to booting into Windows.
In the log file
/var/log/syslog I notice that on two occasions just before shutdown the last command to be executed is
CRON: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
I am happy to completely remove Windows 10 and/or UEFI and/or anything else related to Windows, but I wonder if that will create any problems in future. Any suggestions? Thanks in advance.