MIA ----- Original message ----- From: Paul Rogers <paulgrog...@fastmail.fm> To: lfs-support-requ...@lists.linuxfromscratch.org Subject: Re: Another Question on Dual Boot Date: Sat, 17 Sep 2016 21:54:33 -0700
> I have built an LFS system that I now wish to migrate to my main box. > To do this, I plugged in a USB drive, mounted it to /root/tmp , and > ran the command: dd if=/dev/sda1 bs=64K | gzip -c > tmp/drive.gz That step is problematic. You're transplanting the whole partition. That's not the thing to do. Partitions have a first "track" disk parameter block, i.e. MBR, just as drives do. It's specific to the disk geometry. Yes, they can contain boot code--how does chain loading work, eh? ;-) Secondly, the partiton table of the new drive won't have the soon to be second partition defined--and even if you predefine it, the transplanted partition won't "look right". What you need to do is boot into single user mode, then tar it to the USB using the -l parameter so it doesn't take other filesystems, e.g. /proc /sys /run, et al. Then restore them on a partition you defined and formatted using your LiveCD in the main box. > On my main box, I will fire up a live cd, plug in my USB drive and > restore with this command gunzip -c tmp/drive.gz | dd of=/dev/sda2 > bs=64K The reason it won't be sda1 is because windows is on there. No problem at all. > After doing that, I will chroot into the newly restored system and run > grub-install /dev/sda In my experience, I never quite get the parameters right to make that work properly, and it turns into a big time waster. Since my systems are old enough to still have floppy drives, I just type in a basic boot command to a GRUB rescue floppy, single, then run grub-install. Get GRUB on your new box to make you a rescue USB thumbdrive. (Something I haven't had to explore yet.) > And of course, I'll update /etc/fstab /etc/hosts /etc/hostname and so > on to conform to the new system. You still didn't touch the partition table. > My question is on the grub.cfg syntax so that I can boot windows. I > guessed it will probably look something like this: menuentry "Windows > 7" { insmod chain insmod ntfs set root=(hd0,msdos1) chainloader +1 } > Will that work, or will I need something more complex? Simpler. Use grub-mkconfig, and then edit it HEAVILY into some kind of sanity. -- http://www.fastmail.com - Same, same, but different... -- http://lists.linuxfromscratch.org/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page Do not top post on this list. A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? http://en.wikipedia.org/wiki/Posting_style