Solved: mysql service was disabled on may machine.
I solved the problem in this way:
1) sudo rccconf 2) select mysql and save 3) sudo apt update 4) sudo apt upgrade (or install something else, e.g. for me solved after I installed google-chrome)
Solved: mysql service was disabled on may machine.
I solved the problem in this way:
1) sudo rccconf
2) select mysql and save
3) sudo apt update
4) sudo apt upgrade (or install something else, e.g. for me solved after I installed google-chrome)