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Re: Debian 8 and Debian 9 Dual Boot





On 11/29/2017 03:59 AM, Joe wrote:
On Tue, 28 Nov 2017 22:15:22 -0500
Dan Norton <dnorton@xxxxxxxxxxxxxx> wrote:

On 11/13/2017 01:55 PM, Joe wrote:
On Mon, 13 Nov 2017 11:01:27 -0500
Dan Norton <dnorton@xxxxxxxxxxxxxx> 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...


It doesn't get as far as grub. These are coming from bios(?) after POST:

[...]
DHCP... (spins for about a minute, then:)

Realtek PCIe GBE Family Controller Series v2.38 (12/24/10)
CLIENT MAC ADDR: <hex addr>  GUID: <hex id>
PXE-E53: No boot filename received
PXE-MOF: Exiting PXE ROM.
ERROR:No boot disk has been detected or the disk has failed. (full stop)