yesterday from terminal I've upgraded ubuntu 14.04 to 16.04 from terminal. All is gone well but now there is a really slow start up and also on shutdown, like over than a minute! Can something went wrong? Or I maybe missed something? Thanks in advice to everyone.
According to file in your pastebin link problem was with /etc/fstab file not being configured correctly. It is looking for partition with UUID ef630b6f\x2dae8c\x2d463c\x2d836a\x2dcd18e4f2fe21
Easy way to solve is open your /etc/fstab and check which partition is under problem. After that run command "sudo blkid". Update the partition UUID with the correct partition that you have.
Your problem should be solved after this.