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New Error Screen After Ubuntu 15.10 Install
Posted: 23. Oct 2015, 11:19
by 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 3019 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
Re: New Error Screen After Ubuntu 15.10 Install
Posted: 23. Oct 2015, 13:30
by 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.
Re: New Error Screen After Ubuntu 15.10 Install
Posted: 23. Oct 2015, 13:47
by 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.
Re: New Error Screen After Ubuntu 15.10 Install
Posted: 23. Oct 2015, 14:35
by 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.
Re: New Error Screen After Ubuntu 15.10 Install
Posted: 23. Oct 2015, 14:38
by 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
Re: New Error Screen After Ubuntu 15.10 Install
Posted: 23. Oct 2015, 14:49
by 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.
Re: New Error Screen After Ubuntu 15.10 Install
Posted: 23. Oct 2015, 15:26
by mpack
loukingjr wrote: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.
Re: New Error Screen After Ubuntu 15.10 Install
Posted: 23. Oct 2015, 15:28
by loukingjr
what?
The LiveCD is an .iso. As they have been for umpteen years. No Slapping!.
Re: New Error Screen After Ubuntu 15.10 Install
Posted: 23. Oct 2015, 15:33
by loukingjr
I think they use SquashFS to make the .iso as small as possible.
Re: New Error Screen After Ubuntu 15.10 Install
Posted: 23. Oct 2015, 15:38
by 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.
Re: New Error Screen After Ubuntu 15.10 Install
Posted: 23. Oct 2015, 15:41
by 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.
Re: New Error Screen After Ubuntu 15.10 Install
Posted: 23. Oct 2015, 16:42
by mpack
loukingjr wrote: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.