------- Comment From shriy...@in.ibm.com 2016-03-08 00:16 EDT-------
This issue is seen on Ubuntu 16.04 while doing dist-upgrade operation to 
upgrade from  4.4.0-8-generic ->  4.4.0-11-generic

Kernel version :  4.4.0-8-generic

[413567.554671] EXT4-fs (vda1): VFS: Can't find ext4 filesystem
[413567.556233] EXT4-fs (vda1): VFS: Can't find ext4 filesystem
[413567.557655] EXT4-fs (vda1): VFS: Can't find ext4 filesystem
[413567.558982] FAT-fs (vda1): bogus number of reserved sectors
[413567.566500] FAT-fs (vda1): bogus number of reserved sectors
[413567.575724] qnx4: no qnx4 filesystem (no root dir).
[413567.576994] ufs: You didn't specify the type of your ufs filesystem
[413567.576994]
[413567.576994] mount -t ufs -o 
ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
[413567.576994]
[413567.576994] >>>WARNING<<< Wrong ufstype may corrupt your filesystem, 
default is ufstype=old
[413567.577599] ufs: ufs_fill_super(): bad magic number
done

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https://bugs.launchpad.net/bugs/1416396

Title:
  Unknown file system warning messages during dist-upgrade operation

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