27th August 2016, 9:06
On this blackscreen try hitting Alt+F2. If it shows krunner application launcher at the top then maybe only plasmashell failed to start.
Try opening up a konsole with krunner and execute plasmashell to see if it is working and if not post the error message here (please use quotations for this otherwise antispam measurements might ban you)
Try opening up a konsole with krunner and execute plasmashell to see if it is working and if not post the error message here (please use quotations for this otherwise antispam measurements might ban you)