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Questions[uuid](ubuntu)

Martin Hope
Sebr
Asked: 2020-08-19 02:43:51 +0800 CST
  • 5

I'm trying to setup my external harddrive to mount automatically on startup, following Akshit's terminal guide.

I initially used the PARTUUID in `/etc/fastab' instead of the UUID:

UUID=191486e0-6049-46aa-973c-425d317b629a /mnt/nas exfat uid=1000,gid=1000,umask=0022,auto,rw 0 0

This gave me an error when I ran findmnt --verify --verbose at which point I rechecked blkid and noticed that I'd been using the partition ID:

/dev/sdb1: LABEL="My Book" UUID="20C9-C659" TYPE="exfat" PTTYPE="atari" PARTLABEL="My Book" PARTUUID="191486e0-6049-46aa-973c-425d317b629a"

So I've added the actual UUID in fstab, but now I'm not sure if I should be using that or if I should be using the PARTUUID, and why my UUID is so much shorter than other examples that I've seen (especially when a "UUID is guaranteed to be unique. As far as I know, collisions will not happen within the lifetime of the universe").

fstab partitioning mount automount uuid
Martin Hope
Xu Shijie
Asked: 2019-05-04 06:54:21 +0800 CST
  • 5

I am asking how to change uuid in /boot/grub/grub.cfg, so that grub can load OS on a specified partition.

I have two disks:

  • SSD /dev/sda1 with uuid d7f0cf11-3edf-4859-b65a-3b5bc60ea7b9
  • HDD /dev/sdb1 with uuid 47d9205b-00a8-40e5-88d6-e8b9571799a7

Both disks contain the same content (a Ubuntu root) but different partition uuids, as content of sda1 is cloned from sdb1 by clonezilla

The problem is /boot/grub/grub.cfg, which is automatically generated, contains: 

           if [ x$feature_platform_search_hint = xy ]; then
              search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1  47d9205b-00a8-40e5-88d6-e8b9571799a7
            else
              search --no-floppy --fs-uuid --set=root 47d9205b-00a8-40e5-88d6-e8b9571799a7
            fi
            echo    'Loading Linux 4.4.0-146-generic ...'
            linux   /boot/vmlinuz-4.4.0-146-generic root=UUID=47d9205b-00a8-40e5-88d6-e8b9571799a7 ro  quiet splash $vt_handoff

indicating that grub chooses Ubuntu root from sdb1 instead of sda1, while i want it to choose sda1.

I tried replace all 47d9205b-00a8-40e5-88d6-e8b9571799a7 by d7f0cf11-3edf-4859-b65a-3b5bc60ea7b9 directly, and then run update-grub, but then everything is reverted back.

So is there any other better solution? the /boot/grub/grub.cfg is actually generated automatically. If I detached the sdb1, grub was unable to launched, as it could not find the uuid of sdb1.

Thanks

Updates: 

shijiex@shijie:~$ cat /etc/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>
proc            /proc           proc    nodev,noexec,nosuid 0       0
# / was on /dev/sda1 during installation
UUID=d7f0cf11-3edf-4859-b65a-3b5bc60ea7b9  /               ext4    errors=remount-ro 0       1

#UUID=47d9205b-00a8-40e5-88d6-e8b9571799a7 /old_os               ext4    errors=remount-ro 0       2
# /backup was on /dev/sda5 during installation
UUID=d36e69de-3af8-4302-a2b1-f32c2538493d /backup         ext4    defaults        0       0
# /home was on /dev/sda7 during installation
UUID=95ffe5be-ed1c-4d2b-b745-e31ba62ca63d /home           ext4    defaults        0       2
#UUID=e2ae897d-62b1-45d3-a17a-49e7a1b8fbe7 /home           ext4    defaults        0       2

# /vm was on /dev/sda8 during installation
#UUID=222bf555-b2d3-4607-a856-f5fd785b1862  /vm            ext4    defaults        0       2
# /opt was on /dev/sda8 during installation
UUID=ffbc1ea0-f426-4def-9349-a6f68b486b2f  /opt       ext4    defaults        0       0
# /other was on /dev/sda6 during installation
UUID=657778bc-fde8-4261-9fe6-4134c6a7fb3f /other          ext4    defaults        0       0


# /other was on /dev/sda6 during installation
#UUID=6db98036-2350-4289-b9ef-8e0a2ae52eeb /win           ext4    defaults        0       2


# swap was on /dev/sda9 during installation
UUID=71c498b2-3484-4d5b-b64a-270cc352841b  none            swap    sw              0       0
#UUID=05f1ba29-4188-40d1-8597-de708b48ed50  /tmp           swap    sw              0       0

and blkid: 

 shijiex@shijie:~$ sudo blkid 

[sudo] password for shijiex: 
/dev/sda1: UUID="d7f0cf11-3edf-4859-b65a-3b5bc60ea7b9" TYPE="ext4" PARTUUID="2fe05ff9-01"
/dev/sda3: UUID="95ffe5be-ed1c-4d2b-b745-e31ba62ca63d" TYPE="ext4" PARTUUID="2fe05ff9-03"
/dev/sda4: UUID="8d114eed-5ce4-4d6f-8a28-8a7092b01d46" TYPE="ext4" PARTUUID="2fe05ff9-04"
/dev/sda5: UUID="94b0fb65-f56d-426d-81f9-d05a8ac783eb" TYPE="ext4" PARTUUID="2fe05ff9-05"
/dev/sdb1: UUID="47d9205b-00a8-40e5-88d6-e8b9571799a7" TYPE="ext4" PARTUUID="0001c588-01"
/dev/sdb10: LABEL="New Volume" UUID="6db98036-2350-4289-b9ef-8e0a2ae52eeb" TYPE="ext4" PARTUUID="0001c588-0a"
/dev/sdb11: UUID="ffbc1ea0-f426-4def-9349-a6f68b486b2f" TYPE="ext4" PARTUUID="0001c588-0b"
/dev/sdb5: UUID="d36e69de-3af8-4302-a2b1-f32c2538493d" TYPE="ext4" PARTUUID="0001c588-05"
/dev/sdb6: UUID="657778bc-fde8-4261-9fe6-4134c6a7fb3f" TYPE="ext4" PARTUUID="0001c588-06"
/dev/sdb7: UUID="e2ae897d-62b1-45d3-a17a-49e7a1b8fbe7" TYPE="ext4" PARTUUID="0001c588-07"
/dev/sdb8: UUID="222bf555-b2d3-4607-a856-f5fd785b1862" TYPE="ext4" PARTUUID="0001c588-08"
/dev/sdb9: UUID="71c498b2-3484-4d5b-b64a-270cc352841b" TYPE="swap" PARTUUID="0001c588-09"
/dev/loop0: TYPE="squashfs"
/dev/loop1: TYPE="squashfs"
/dev/loop2: TYPE="squashfs"
/dev/loop3: TYPE="squashfs"
/dev/loop4: TYPE="squashfs"
grub2 boot partitioning mount uuid
Martin Hope
Ivan Sidaruk
Asked: 2019-02-21 08:38:21 +0800 CST
  • 4

I have Ubuntu 18.04.2 LTS installed on SSD, and I mounted HDD also for data. But when I did this, the UUID it has consists of random set of numbers and letter like this /mnt/9d79a504-bf86-4a1f-99e4-927b9e20df6e and even if I labeled it and gave a simple name to my disk - Storage, I still can't navigate to it like cd /mnt/Storage in terminal, I tried to give it an alias also, but it's failed. So is anyone who can help me with that? Thanks!

I checked this links below, which looked similar, but, I forced to ask this question. How can I give other drives and partitions short, meaningful names in nautilus? How to change drive's name?

terminal screen

UPDATED:

solved screen

partitioning mount hard-drive uuid
Martin Hope
rkeating
Asked: 2018-07-31 13:23:10 +0800 CST
  • 38

Running Ubuntu 18.04, I changed from a swap partition to a swap file.

swapon -s (summary) and free show the swapfile with the new size. /etc/fstab was changed, permission on the swapfile changed and the swap partition was deleted. When there are updates (apt-get update and upgrade), I get this error:

Setting up amd64-microcode (3.20180524.1~ubuntu0.18.04.2) ...
update-initramfs: deferring update (trigger activated)
amd64-microcode: microcode will be updated at next boot
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Processing triggers for initramfs-tools (0.130ubuntu3.1) ...
update-initramfs: Generating /boot/initrd.img-4.15.0-29-generic
W: initramfs-tools configuration sets RESUME=UUID=c5a2c6f4-b67c-4d95-bc23-8333ed6c0f11
W: but no matching swap device is available.

The UUID listed there is for the old swap partition. I didn't think a swap file has a UUID, but I am not sure about that. Everything else seems to work fine. How should I proceed to troubleshoot and fix this?

swap resume uuid
Martin Hope
Cameron Aziz
Asked: 2012-03-06 07:59:43 +0800 CST
  • 24

Ive been tearing my hair out for about a week now trying to figure out how to do this.

I have two HDD's in my server, both 250gig. They both have ubuntu installed, one is currently booted. I want to mount the second (old) drive to /mnt/external

If I mount through /dev/disk/by-uuid It just mounts the boot partition, and not my actual data.

I also tried vgs-v to determine, but the names are the same, and don't know where to go from here.

root@onlinelabtests:~# vgs -v
Finding all volume groups
Finding volume group "SysVolGroup"
Archiving volume group "SysVolGroup" metadata (seqno 3).
Archiving volume group "SysVolGroup" metadata (seqno 3).
Creating volume group backup "/etc/lvm/backup/SysVolGroup" (seqno 3).
Finding volume group "SysVolGroup"
Archiving volume group "SysVolGroup" metadata (seqno 3).
Archiving volume group "SysVolGroup" metadata (seqno 3).`
Creating volume group backup "/etc/lvm/backup/SysVolGroup" (seqno 3).
VG          Attr   Ext   #PV #LV #SN VSize   VFree VG UUID      
SysVolGroup wz--n- 4.00m   1   2   0 233.72g    0  812dMv-qSf3-xnpP-khlB-mkIf-q64l-Z2Rawf     
SysVolGroup wz--n- 4.00m   1   2   0 233.72g    0  Z3IbWM-FEvq-n6fs-lhm9-5uQq-mdxj-QNfDLJ

and this

root@onlinelabtests:~# vgchange -a y
2 logical volume(s) in volume group "SysVolGroup" now active
2 logical volume(s) in volume group "SysVolGroup" now active

But /dev/disk/by-uuid still doesnt show anything else.
Any help appreciated.

mount uuid