Re: [PLUG] Ubuntu 16.04 upgrade problem

Sadly, this won't help you with what you have today, but for the future, please consider setting up two alternate root partitions, let's call them A and B. When A is mounted as /, B is mounted as /spare and vice versa. Start with A booted as root, and B booted as spare. The details here are for Ubuntu, but the basic principles are the same for any Linux distro.

sudo rm -rf /spare/*

sudo rsync --sparse --exclude=lastlog -auvx / /spare/

cp -p --sparse=always /var/log/lastlog /spare/var/log/

Edit /spare/etc/fstab to swap the UUIDs for / and /spare

sudo update-grub

Edit /boot/grub/grub.cfg to make sure all the UUIDs in the os-prober section point to B (I don't know whether it's a bug or a feature, but the UUIDs generated by update-grub are a mix of those for A and B). Save the file.

Save the file as /spare/boot/grub/grub.cfg (save before editing as a safety mechanism to prevent inadvertent damage to /boot/grub/grub.cfg on A).

Edit to swap the UUIDs and partition entries for the main and memory section and the os-prober sections, since this will be the /boot/grub/grub.cfg that boots with B as root.

Reboot. On the grub menu, choose B and after booting, verify that B is / and A is /spare.

Upgrade. I always prefer the non-graphical do-release-upgrade, but that's your choice. If the upgrade is successful, the machine will boot B by default (and the old A as /spare). But importantly, if the upgrade fails, simply rebooting the machine will boot into the unmodified root partition A.

Regards

-- Bhaskar

On Mon, Aug 8, 2016 at 10:00 PM, Eric Lucas <eric@lucii.org> wrote:

Eric, given that dhclient still restores the connectivity, I'd guess that it did not not really switch
to static networking?
Because it's using systemd - I have to bow out. The last Debian/Ubuntu system I set manually
was, um, 3 or 4 years ago. That was with help. There are experts here on the list and
various Internet sites that have forgotten more than I know :-(

Best of luck
Eric
On Mon, Aug 8, 2016 at 7:51 PM, Eric H. Johnson <ejohnson@camalytics.com> wrote:
Eric,

Just tried that. Did not work. Funny thing is dhclient release and renew still brings the network back.

I might have been wrong about needing to start network-manager manually. Now I just need to do a release and renew with dhclient.

Thanks,
Eric
On August 8, 2016 7:42:19 PM EDT, Eric Lucas <eric@lucii.org> wrote:
For a quick workaround try setting it up with static network addressing and see if that works and is stable.

Eric Lucas

On Mon, Aug 8, 2016 at 7:18 PM, Eric H. Johnson <ejohnson@camalytics.com> wrote:
All,

Poor timing on my part. I donated a computer to a senior center, and just upgraded it to 16.04. I am running into a problem, and about to leave town.

The upgrade indicated that it had a problem and needed to roll back, however after I rebooted at the end it was showing the OS as 16.04. The problem is that the networking is not coming up automatically. I can start it manually with

service network-manager start
dhclient –r
dhclient

Additionally, if I use settings | network and turn the network off and on, networking will again stop working, however network-manager is still working, because at that point, if I just release and renew dhcp (dhcient) then the network will come back. I can try setting a fixed ip address, but I do not think that is going to work because network-manager is not coming up.

I need at least a quick work around. Any ideas?

Thanks,
Eric

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___________________________________________________________________________
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___________________________________________________________________________
Philadelphia Linux Users Group -- http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug