After some research, there seems to be a suggestion that the problem is related to the fstab file? (see here http://ubuntuforums.org/showthread.php?t=1595358 )
Below is the fstab that freezes
# /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>
/dev/mapper/ubuntu--studio--vg-root / ext4 errors=remount-ro 0 1
# /boot was on /dev/sdb2 during installation
UUID=9d1e0e51-a62e-434b-a41f-9219cfbfab77 /boot ext2 defaults 0 2
# /boot/efi was on /dev/sdb1 during installation
UUID=0180-0C11 /boot/efi vfat umask=0077 0 1
/dev/mapper/ubuntu--studio--vg-swap_1 none swap sw 0 0
For comparison, here is the fstab from the live ISO, (which boots fine.)
overlay / overlay rw 0 0
tmpfs /tmp tmpfs nosuid,nodev 0 0
Knowing very little about fstab and understanding even less, I have no idea about how to proceed. So, would anybody care to comment on the above files, point me in right direction or otherwise give me a few clues? Additionaly, would it be worthwhile replacing the fstab that freezes with the fstab form the live ISO, or would that just muck things up beyond repair?
Thanks in advance, Irvine
Okay, I have done some more checking, (along with quite a lot of guessing,) and no longer think it is anything to do with the file system?
I have run the fdisk and fsck utilities from the live media, and here are the abreviated results
ubuntu-studio@ubuntu-studio:~$ sudo fdisk -l /dev/sda
Disk /dev/sda: 238.5 GiB, 256060514304 bytes, 500118192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 96F766AC-324F-4BFD-B049-3E22ABE952F8
Device Start End Sectors Size Type
/dev/sda1 2048 1050623 1048576 512M EFI System
/dev/sda2 1050624 466903039 465852416 222.1G Linux filesystem
/dev/sda3 466903040 500117503 33214464 15.9G Linux swap
ubuntu-studio@ubuntu-studio:~$ sudo mount /dev/sda2 /mnt
ubuntu-studio@ubuntu-studio:~$ ls /mnt
bin core home lib64 mnt root srv usr
boot dev initrd.img lost+found opt run sys var
cdrom etc lib media proc sbin tmp vmlinuz
ubuntu-studio@ubuntu-studio:~$ cat /mnt/etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=15.10
DISTRIB_CODENAME=wily
DISTRIB_DESCRIPTION="Ubuntu 15.10"
ubuntu-studio@ubuntu-studio:~$ sudo fdisk -l
Disk /dev/sda: 238.5 GiB, 256060514304 bytes, 500118192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 96F766AC-324F-4BFD-B049-3E22ABE952F8
Device Start End Sectors Size Type
/dev/sda1 2048 1050623 1048576 512M EFI System
/dev/sda2 1050624 466903039 465852416 222.1G Linux filesystem
/dev/sda3 466903040 500117503 33214464 15.9G Linux swap
ubuntu-studio@ubuntu-studio:~$ sudo fsck /dev/sda2
fsck from util-linux 2.26.2
e2fsck 1.42.12 (29-Aug-2014)
/dev/sda2: clean, 289896/14565376 files, 2673116/58231552 blocks
ubuntu-studio@ubuntu-studio:~$ sudo fsck /dev/sda1
fsck from util-linux 2.26.2
fsck.fat 3.0.28 (2015-05-16)
/dev/sda1: 6 files, 864/130812 clusters
One point to note though is that unlike /dev/sda2, /dev/sda1 is not marked as "clean". Is that relevant? After all, this is the EFI partition, and if the problem was there, then the grub2 bootlaoder wouldn't load?
I have also discovered some more symptoms:
Switching external media OFF and ON creates more ouput as it connects and disconnects from the devices.
Additionaly, when I power off to reboot into the live media, I get the Ubuntu Studio log-off screen
As a result, I think it is something to do with the desktop logon screen not loading?
Does anybody have any views on this, or even better, understand what is going wrong?
Thanks Irvine
Okay, it is definately something to do with the desktop not loading. When it freezes I managed to load the tty1 terminal. Subsequently, I tried reinstalling xorg and lightdm as suggested for a similar problem with 15.04: https://askubuntu.com/questions/638850/ubuntu-15-04-boot-hangs-on-starting-light-display-manager-after-updates
Needless to say, that particular solution failed, but, since I can load the tty1 terminal, it is looking more and more like the problem is something to do with the desktop.
Alternatively, there was a new bug report filed yesterday, (while I was installing Ubuntu Studio,) that suggests it may be something to do with the kernel version. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1548867
I am not sure what is the best direction to take here, and am definately way above my paygrade, so a little bit of advice would be extremely welcome.
Thanks Irvine
Edit
I just rebooted into tty1 and checked the kernel version, it is : 4.2.0-16- lowlatency and is dated Oct 2015.
So, does this exclude it being a problem with the kernel?
Irvine
The problem is definately something to do with xorg crashing. Unfortunately, (after searching online,) there are a multitude of possible reasons for it to crash, and some of the suggested solutions strike me as being dangerous.
Could somebody who knows what they are doing look at this Xorg log file and offer suggestions.
[ 559.880]
X.Org X Server 1.17.2
Release Date: 2015-06-16
[ 559.880] X Protocol Version 11, Revision 0
[ 559.880] Build Operating System: Linux 3.19.0-30-generic x86_64 Ubuntu
[ 559.880] Current Operating System: Linux That-One 4.2.0-16-lowlatency #19-Ubuntu SMP PREEMPT Thu Oct 8 16:19:23 UTC 2015 x86_64
[ 559.881] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-lowlatency root=UUID=9e999e92-e988-43f8-8cc1-b23bc112c0bc ro quiet splash vt.handoff=7
[ 559.881] Build Date: 30 September 2015 09:08:47AM
[ 559.881] xorg-server 2:1.17.2-1ubuntu9 (For technical support please see http://www.ubuntu.com/support)
[ 559.882] Current version of pixman: 0.32.6
[ 559.885] Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
[ 559.886] Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 559.891] (==) Log file: "/var/log/Xorg.0.log", Time: Wed Feb 24 17:24:51 2016
[ 559.892] (==) Using config file: "/etc/X11/xorg.conf"
[ 559.893] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 559.893] (==) ServerLayout "layout"
[ 559.893] (**) |-->Screen "nvidia" (0)
[ 559.893] (**) | |-->Monitor "<default monitor>"
[ 559.894] (**) | |-->Device "nvidia"
[ 559.894] (==) No monitor specified for screen "nvidia".
Using a default monitor configuration.
[ 559.894] (**) |-->Inactive Device "intel"
[ 559.894] (==) Automatically adding devices
[ 559.894] (==) Automatically enabling devices
[ 559.894] (==) Automatically adding GPU devices
[ 559.894] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[ 559.894] Entry deleted from font path.
[ 559.894] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[ 559.894] Entry deleted from font path.
[ 559.894] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[ 559.894] Entry deleted from font path.
[ 559.894] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[ 559.894] Entry deleted from font path.
[ 559.894] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[ 559.894] Entry deleted from font path.
[ 559.894] (==) FontPath set to:
/usr/share/fonts/X11/misc,
/usr/share/fonts/X11/Type1,
built-ins
[ 559.894] (==) ModulePath set to "/usr/lib/x86_64-linux-gnu/xorg/extra-modules,/usr/lib/xorg/extra-modules,/usr/lib/xorg/modules"
[ 559.894] (II) The server relies on udev to provide the list of input devices.
If no devices become available, reconfigure udev or disable AutoAddDevices.
[ 559.894] (II) Loader magic: 0x5602f8b56d40
[ 559.894] (II) Module ABI versions:
[ 559.894] X.Org ANSI C Emulation: 0.4
[ 559.894] X.Org Video Driver: 19.0
[ 559.894] X.Org XInput driver : 21.0
[ 559.894] X.Org Server Extension : 9.0
[ 559.894] (II) xfree86: Adding drm device (/dev/dri/card0)
[ 559.896] (--) PCI:*(0:0:2:0) 8086:1916:1179:f840 rev 7, Mem @ 0x92000000/16777216, 0xa0000000/268435456, I/O @ 0x00005000/64
[ 559.896] (--) PCI: (0:1:0:0) 10de:1346:1179:f843 rev 162, Mem @ 0x93000000/16777216, 0x80000000/268435456, 0x90000000/33554432, I/O @ 0x00004000/128
[ 559.896] (II) LoadModule: "glx"
[ 559.896] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 559.896] (II) Module glx: vendor="X.Org Foundation"
[ 559.896] compiled for 1.17.2, module version = 1.0.0
[ 559.896] ABI class: X.Org Server Extension, version 9.0
[ 559.896] (==) AIGLX enabled
[ 559.896] (II) LoadModule: "nvidia"
[ 559.897] (WW) Warning, couldn't open module nvidia
[ 559.897] (II) UnloadModule: "nvidia"
[ 559.897] (II) Unloading nvidia
[ 559.897] (EE) Failed to load module "nvidia" (module does not exist, 0)
[ 559.897] (II) LoadModule: "modesetting"
[ 559.897] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[ 559.897] (II) Module modesetting: vendor="X.Org Foundation"
[ 559.897] compiled for 1.17.2, module version = 1.17.2
[ 559.897] Module class: X.Org Video Driver
[ 559.897] ABI class: X.Org Video Driver, version 19.0
[ 559.897] (==) Matched intel as autoconfigured driver 0
[ 559.897] (==) Matched intel as autoconfigured driver 1
[ 559.897] (==) Matched modesetting as autoconfigured driver 2
[ 559.897] (==) Matched fbdev as autoconfigured driver 3
[ 559.897] (==) Matched vesa as autoconfigured driver 4
[ 559.897] (==) Assigned the driver to the xf86ConfigLayout
[ 559.897] (II) LoadModule: "intel"
[ 559.897] (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so
[ 559.897] (II) Module intel: vendor="X.Org Foundation"
[ 559.897] compiled for 1.17.2, module version = 2.99.917
[ 559.897] Module class: X.Org Video Driver
[ 559.897] ABI class: X.Org Video Driver, version 19.0
[ 559.897] (II) LoadModule: "modesetting"
[ 559.897] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[ 559.897] (II) Module modesetting: vendor="X.Org Foundation"
[ 559.897] compiled for 1.17.2, module version = 1.17.2
[ 559.897] Module class: X.Org Video Driver
[ 559.897] ABI class: X.Org Video Driver, version 19.0
[ 559.897] (II) UnloadModule: "modesetting"
[ 559.897] (II) Unloading modesetting
[ 559.897] (II) Failed to load module "modesetting" (already loaded, 22018)
[ 559.897] (II) LoadModule: "fbdev"
[ 559.897] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[ 559.897] (II) Module fbdev: vendor="X.Org Foundation"
[ 559.897] compiled for 1.17.1, module version = 0.4.4
[ 559.897] Module class: X.Org Video Driver
[ 559.897] ABI class: X.Org Video Driver, version 19.0
[ 559.897] (II) LoadModule: "vesa"
[ 559.897] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[ 559.897] (II) Module vesa: vendor="X.Org Foundation"
[ 559.897] compiled for 1.17.1, module version = 2.3.4
[ 559.897] Module class: X.Org Video Driver
[ 559.897] ABI class: X.Org Video Driver, version 19.0
[ 559.897] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[ 559.897] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
i810, i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G,
915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,
Pineview G, 965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33,
GM45, 4 Series, G45/G43, Q45/Q43, G41, B43
[ 559.898] (II) intel: Driver for Intel(R) HD Graphics: 2000-6000
[ 559.898] (II) intel: Driver for Intel(R) Iris(TM) Graphics: 5100, 6100
[ 559.898] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics: 5200, 6200, P6300
[ 559.898] (II) FBDEV: driver for framebuffer: fbdev
[ 559.898] (II) VESA: driver for VESA chipsets: vesa
[ 559.898] (++) using VT number 1
[ 559.898] (--) controlling tty is VT number 1, auto-enabling KeepTty
[ 559.898] (II) modeset(G0): using drv /dev/dri/card0
[ 559.898] (WW) Falling back to old probe method for fbdev
[ 559.898] (II) Loading sub module "fbdevhw"
[ 559.898] (II) LoadModule: "fbdevhw"
[ 559.898] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 559.898] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 559.898] compiled for 1.17.2, module version = 0.0.2
[ 559.898] ABI class: X.Org Video Driver, version 19.0
[ 559.898] (WW) Falling back to old probe method for vesa
[ 559.898] (EE) No devices detected.
[ 559.898] (EE)
Fatal server error:
[ 559.898] (EE) no screens found(EE)
[ 559.898] (EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 559.898] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 559.898] (EE)
Due to a very limited data allowance, I can't immediately do a major download. So, tommorow, failing some easy, obvious solution I shall visit a friend and use his internet to install propietary drivers from the terminal. Hopefully, this will solve the problem, though I would still like some guidance.
Irvine