I am constantly face this problem. When i start my laptop it checks the disk for errors , after that it shows , " some defects are found " when i press 'F' to Fix errors , it shows /tmp is not ready message . What i need to do to overcome this problem ?
Restart your machine. When you get to the grub screen press ESC and choose a "rescue mode" option. This will let you get into the system but / will be read only.
Then run your normal fixes. More then likely:
Once it's done reboot. Everything should be back to normal. As a side note, if you need to remount the / as read write for some reason the command is: