WP 4.9.8
All plugins up to date
No cache plugin in use
Prior to upgrade could only reach validations page under Pro menu item, everything else is internal server error
My site is up but for attempts to upgrade, which seem to go on forever but never complete, resulting in a page stating “Briefly unavailable for scheduled maintenance. Check back in a minute.”
Header notice across admin pages states “An automated WordPress update has failed to complete - please attempt the update again now.” Clicking that link does nothing.
Security plugins include Loginizer and Wordfence.
Halp!