[bitfolk] Problem updating ubuntu

Hi Guys, I'm out of my depth. Help needed. Running Ubuntu. After applying changes, including those "Held back" by Apt-get, it reported that it needed a restart. The restart failed. Finally got onto the console and saw it was failing with error: file `/boot/vmlinuz-4.4.0-127-generic' not found. So tried the other (older) versions listed and an old version is now running. Now running is ian@hobsoni:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.4 LTS Release: 16.04 Codename: xenial ian@hobsoni:~$ How can I recover, and get grub set up so default boot works again please? Just in case it removes "disk full" questions... ian@hobsoni:~$ df -h Filesystem Size Used Avail Use% Mounted on udev 1.5G 0 1.5G 0% /dev tmpfs 300M 4.4M 296M 2% /run /dev/xvda1 14G 4.9G 7.6G 40% / tmpfs 1.5G 0 1.5G 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 1.5G 0 1.5G 0% /sys/fs/cgroup tmpfs 300M 0 300M 0% /run/user/1000 ian@hobsoni:~$ df -i Filesystem Inodes IUsed IFree IUse% Mounted on udev 381064 358 380706 1% /dev tmpfs 383485 525 382960 1% /run /dev/xvda1 884736 252470 632266 29% / tmpfs 383485 1 383484 1% /dev/shm tmpfs 383485 5 383480 1% /run/lock tmpfs 383485 16 383469 1% /sys/fs/cgroup tmpfs 383485 4 383481 1% /run/user/1000 ian@hobsoni:~$ Thanks Ian -- Ian Hobson Tel (+351) 910 418 473