Re: Debian 8 and Debian 9 Dual Boot
On Tue, 28 Nov 2017 22:15:22 -0500
Dan Norton <dnorton@mindspring.com> wrote:
> On 11/13/2017 01:55 PM, Joe wrote:
> > On Mon, 13 Nov 2017 11:01:27 -0500
> > Dan Norton <dnorton@mindspring.com> wrote:
> >
> >
> >> Although I didn't say so, each install would have its own set of
> >> directories. Please say more about how to mount the other
> >> installation and share data. How to mount things in another volume
> >> group?
> >>
> > Good advice so far, but to add a bit: all LVM groups will be seen at
> > boot, and /dev will know about them. See man lvm2 and also here:
> >
> > https://wiki.debian.org/LVM for complete information about the
> > commands you have available. There are also numerous tutorials on
> > the Net which show basic usage of the simpler commands. It's worth
> > having a look when you have some spare time, as one day you'll need
> > to know some of this and won't have any spare time.
>
> Reading the wiki reveals "Grub and ?
> <https://wiki.debian.org/LiLo>LiLo are not compatible with LVM,
> so /bootshould be outside the storage disk managed by LVM."
Not many people are using lilo today, and a recent grub2 should have no
problem at all with lvm. But there's no harm in a separate /boot, and
I've always done it that way.
> Here's
> what I have:
>
> Attempts to boot normally do not work. But using Super Grub2 on a
> bootable cd and selecting "Boot manually" and picking the hd1 entry
> brings up the jessie system that the installer reports as
> successfully installed on sda3. Using fdisk to take a look:
>
> dan@debian8:~$ sudo fdisk /dev/sda
> Command (m for help): p
> Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disklabel type: gpt
> Disk identifier: A615A904-0620-459F-BF44-5E53E54FDF24
>
> Device Start End Sectors Size Type
> /dev/sda1 2048 411647 409600 200M BIOS boot
> /dev/sda2 411648 16783359 16371712 7.8G Linux swap
> /dev/sda3 16783360 151001087 134217728 64G Linux LVM
> /dev/sda4 151001088 285218815 134217728 64G Linux LVM
> /dev/sda5 285218816 419436543 134217728 64G Linux LVM
> /dev/sda6 419436544 553654271 134217728 64G Linux LVM
> /dev/sda7 553654272 1953525134 1399870863 667.5G Linux filesystem
>
> Is there a problem here?
Not obviously so. But you know that you have a working installation,
just one with a booting problem, which suggests this is all plausible.
>
> dan@debian8:~$ df -h
> Filesystem Size Used Avail Use% Mounted on
> /dev/dm-0 9.1G 3.0G 5.7G 35% /
> udev 10M 0 10M 0% /dev
> tmpfs 775M 9.0M 766M 2% /run
> tmpfs 1.9G 68K 1.9G 1% /dev/shm
> tmpfs 5.0M 4.0K 5.0M 1% /run/lock
> tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
> /dev/sda1 992K 142K 851K 15% /boot/efi
> /dev/mapper/debian8--vg-var 8.2G 1.3G 6.4G 17% /var
> /dev/mapper/debian8--vg-home 9.1G 356M 8.3G 5% /home
> /dev/mapper/debian8--vg-tmp 268M 2.1M 247M 1% /tmp
> tmpfs 388M 4.0K 388M 1% /run/user/115
> tmpfs 388M 12K 388M 1% /run/user/1000
>
>
> Doesn't this satisfy the statement that "/boot should be outside the
> storage disk managed by LVM" since it is on sda1?
>
> > Look in /etc/fstab for lines beginning /dev/mapper/[volume] which
> > will be the volumes mounted in the running installation. The
> > 'mapper' is turning LVM volumes into things which look like
> > partitions for many purposes.
>
> Here is fstab:
> # /etc/fstab: static file system information.
> #
> # Use 'blkid' to print the universally unique identifier for a
> # device; this may be used with UUID= as a more robust way to name
> devices # that works even if disks are added and removed. See
> fstab(5). #
> # <file system> <mount point> <type> <options> <dump> <pass>
> /dev/mapper/debian8--vg-root / ext4 errors=remount-ro
> 0 1 # /boot/efi was on /dev/sda1 during installation
> UUID=B07E-1F0B /boot/efi vfat umask=0077 0 1
> /dev/mapper/debian8--vg-home /home ext4 defaults
> 0 2 /dev/mapper/debian8--vg-tmp /tmp ext4
> defaults 0 2 /dev/mapper/debian8--vg-var /var
> ext4 defaults 0 2 # swap was on /dev/sda2 during
> installation UUID=6aa1846f-34dd-424d-b02c-dbd0af037a23
> none swap sw 0 0
> /dev/sr0 /media/cdrom0 udf,iso9660 user,noauto 0 0
>
>
> Why won't it boot normally, that is without using the bootable Grub2
> cd?
>
I've had enormous amounts of trouble with grub/grub2 over the years.
Could be anything.
We have to start from the exact screen messages you get when you try
booting. There are different classes of grub problem, and it will drop
you in different shells depending on what it has found.
Please, the error messages, word for word...
--
Joe
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