This is 'Stretching' me.... :(

[Skywatch]

Ok,

So today I decided it was time to upgrade from jessie to stretch as the end of the year support was about to hit!

First pi2 - success
Second pi2 - success
Third pi2 - Fail.

I don't know why - I tried.....

Terminal

xbian@lounge2 ~ $ sudo dpkg --configure -a
[sudo] password for xbian:
sudo: unable to open /var/lib/sudo/ts/xbian: Read-only file system
dpkg: error: unable to access dpkg status area: Read-only file system

I tried rebooting - Initially it seemed to be in a boot-loop. But now is stable and saying it has about 160sih upgrades, but I can't get it any further.

Also......

Terminal

xbian@lounge2 ~ $ sudo apt-get autoremove
[sudo] password for xbian:
sudo: unable to open /var/lib/sudo/ts/xbian: Read-only file system
W: Not using locking for read only lock file /var/lib/dpkg/lock
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
xbian@lounge2 ~ $ sudo reboot
sudo: unable to execute /sbin/reboot: Input/output error
xbian@lounge2 ~ $ sudo poweroff
[sudo] password for xbian:
Sorry, try again.
[sudo] password for xbian:
sudo: unable to open /var/lib/sudo/ts/xbian: Read-only file system
sudo: unable to execute /sbin/poweroff: Input/output error

So...what to try next please? - I am stuck!