New Error Screen After Ubuntu 15.10 Install

[loukingjr]

I just thought I would note this in case anyone else runs into it. I had an Ubuntu 15.10 guest that was running fine but I decided to attach the release version's .iso and reinstall. Once the install was finished and I hit restart I get this screen…

screenshot_24.png (43.79 KiB) Viewed 3018 times

I reset the machine and it started normally. Just never saw this particular error.

Use Host I/O Cache was enabled. OSX 10.11.1 - VB 5.0.8

[mpack]

SquashFS? Does Ubuntu have a disk compression option in this day and age? In that case redundancy has been removed so errors are to be expected, similar to encrypted disks or snapshots.

[loukingjr]

no idea Don. I suspect it had something to do with Host I/O being enabled which I have recently read may not be such a great idea with Linux but I really don't know.

[mpack]

You do realize that you have an unusual filesystem selection on that media, right? I.e. SquashFS instead of EXTx. Is this the primary disk? What is "sr0"? If somebody has used this as the filesystem in a CD/DVD then they need a good head slap. Utterly pointless deviation from established standards.

[loukingjr]

Actually I originally thought the error meant Squas HFS since I'm on a Mac host. I have never even heard of SquashFS.

Code: Select all

00:00:01.477400 File system of '/Applications/VMs/Canonical/Ubuntu 15.10/Ubuntu 15.10.vdi' is hfs

[loukingjr]

Now I have… from wikipedia

SquashFS is a compressed read-only file system for Linux. SquashFS compresses files, inodes and directories, and supports block sizes up to 1 MB for greater compression. SquashFS is also the name of free/open software, licensed under the GPL, for accessing SquashFS filesystems

SquashFS is used by the Live CD versions of Arch Linux, Debian, Fedora, Gentoo Linux, Linux Mint, Salix, Ubuntu and on embedded distributions such as the OpenWrt[6] and DD-WRT router firmware.

Apparently the error was thrown up by the LiveCD .iso.

[mpack]

Apparently the error was thrown up by the LiveCD .iso.

That's what would have merited the slap: calling something an ISO when it isn't.

However having thought about it, my guess is that this is the filesystem used on the RAMdisk.

[loukingjr]

what?

The LiveCD is an .iso. As they have been for umpteen years. No Slapping!.

[loukingjr]

I think they use SquashFS to make the .iso as small as possible.

[Perryg]

FYI I don't see these warnings. That said yes the squashfs is indeed still used and afaik will be for some time. Actually still handy and useful in Linux.

[loukingjr]

I've only seen it once in what, six years? It may have just been an anomaly or perhaps I should have checked the md5 sum.

[mpack]

what?
The LiveCD is an .iso. As they have been for umpteen years. No Slapping!.

I am suggesting that the CD contains an image of the ramdisk, as opposed to file copying, and the ramdisk image uses SquashFS encoding.

You can't use SquashFS for the ISO. No PC BIOS would recognize it, because it wouldn't be an ISO.