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  1. My pc is Multiboot OS from Ubuntu 16.04 or windows10 Boot from Ubuntu fail today. But I can boot from WIN10.

  2. I install ex2fsd in WIN10, and I can see Ubuntu file system from WIN10. the purpose is mounting an Ubuntu file system , the I can view all the files of Ubuntu from window10

  3. I also can see win10 file system from Ubuntu automatically . But I don’t install ex2fsd in Ubuntu 16.04

  4. Boot from Ubuntu fail today. But I can boot from WIN10.

  5. I key in “ubuntu cannot reboot after ex2fsd” in win10 System shows : Recover Ubuntu installation after Ext2Fsd installation I find I can key in e2fsck -b 32768 /dev/sda5 in WIN10
  6. C:\Program Files\Ext2Fsd>e2fsck -b 32768 /dev/sda5 Win10 replies e2fsck 1.42.13 (17-May-2015) e2fsck: Cannot allocate memory while trying to open /dev/sda5

The superblock could not be read or does not describe a valid ext2/ext3/ext4 filesystem. If the device is valid and it really contains an ext2/ext3/ext4 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 or e2fsck -b 32768

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Remove ex2fsd asap. It, and similar Windows drivers, corrupt the Ubuntu ext2/3/4 file system.

fsck the Ubuntu file system after removing this driver.

Search here on AskUbuntu for "superblock" to learn how to use backup superblocks to repair your current file system.

Examples...

How to find superblock?

Journal superblock is corrupt

Superblock invalid, disk in use

BIOS boot partition : how to fix "Superblock invalid"?

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