I have a desktop that has a 4.5 Ghz 6-core processor, 16GB or RAM, and an SSD. It is dual-boot between Windows 10 and Ubuntu 14.04. It boot Windows 10 in ~8 to 10 seconds, while it takes Ubuntu over 3.5 minutes to boot. When I rundmesg, I can see that a process calledsanitized_helpertakes almost 100 seconds to load (?). Then, Bluetooth: RFCOMM v.1.11 takes 110 seconds to load.

First of all, what is "sanitized_helper"? And concerning Bluetooth, Sure, I could disable Bluetooth on boot, but why does it take that long anyway?

Here is the completedmesgoutput: http://paste.ubuntu.com/15344458/

EDIT: As Jeremy31 suggested, I booted into Windows 10 and shutdown withshutdown -h and re-ran dmesg. Ubuntu now boots in around a minute and a half, which is still a long time, but its progress! Here is the complete dmesg output after shutting down in that way: http://paste.ubuntu.com/15344524/

Here are the contents of /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>
# / was on /dev/sda5 during installation
UUID=0b569c46-6cc7-4453-a9ac-7b1828cb202b /               ext4    errors=remount-ro 0       1
# /boot/efi was on /dev/sda2 during installation
UUID=AAA6-1955  /boot/efi       vfat    defaults        0       1
# swap was on /dev/sda6 during installation
UUID=e46d8b08-ea89-4045-8737-e977888b12f5 none            swap    sw              0       0

And here's the output of sudo blkid:

/dev/sda1: LABEL="Recovery" UUID="2480A41480A3EA8E" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="8b6f744e-e767-4348-a14e-0a23726cea33"
/dev/sda2: UUID="AAA6-1955" TYPE="vfat" PARTLABEL="EFI system partition" PARTUUID="676ee6a5-5b9c-4566-b13e-026ccc5deb1c"
/dev/sda3: PARTLABEL="Microsoft reserved partition" PARTUUID="b36a3fce-16dd-4b30-9756-16266ffb1c8b"
/dev/sda4: UUID="0848B0D943211234" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="01a32f3e-31d7-4429-b80e-b538d7b53cd4"
/dev/sda5: UUID="0b569c46-6cc7-4453-a9ac-7b1828cb202b" TYPE="ext4" PARTUUID="a0d08d18-d9db-4e68-afe8-e5bac0bd8755"
/dev/sdb1: PARTLABEL="Microsoft reserved partition" PARTUUID="8f2b6a8e-c0bd-447a-9f41-390249d4866b"
/dev/sdb2: LABEL="2TB Seagate" UUID="2698A69B98A668CF" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="3399edd9-593b-41e6-8bf2-e82f0166da70"
  • Check this answer: Ubuntu 15.04 is loading very slow. Some mounting issue, rather than AppArmor problem. Do you have encrypted volumes? – whtyger Mar 8 '16 at 6:04
  • If your UUID in /etc/fstab is OK, try replacing UUIDs in this file with proper partition names /dev/sdXY, as mentioned here: 15.10 boots very slow – whtyger Mar 8 '16 at 6:11
  • You could post the entire dmesg output at paste.ubuntu.com and then post the link. It almost looks like Win10 is using its hybrid shutdown instead of a full shutdown – Jeremy31 Mar 8 '16 at 11:37
  • +whtyger No, none of the volumes are encrypted. – willem.hill Mar 8 '16 at 23:33
  • What about the other links? Have you checked them? Replacing UUIDs with the device names can resolve your issue. Be careful, make a backup of /etc/fstab beforehand. You can find device name equivalents for your UUIDs using the command sudo blkid. – whtyger Mar 9 '16 at 7:18

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