Thanks dude First I had select and install software error and when I fixed it then I got grub boot loader error Well thanks to you now it's fixed....❤️❤️❤️❤️
The terminal gives this error: Reading package lists... Done Building dependency tree Reading state information... Done Package grub-pc is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package grub-pc has no installation candidate.