Comment 17 for bug 566788

Having the same problem after update 16.10 -> 17.04. Have to do "sudo chmod -R a+w /dev/shm/" after each reboot.

cat /etc/fstab
# /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--vg-root / ext4 errors=remount-ro 0 1
# /boot was on /dev/sda1 during installation
UUID=9a59ceda-072d-4648-93bc-847832b38fa4 /boot ext2 defaults 0 2
/dev/mapper/ubuntu--vg-swap_1 none swap sw 0 0

cat /proc/self/mountinfo | grep shm
26 20 0:21 / /dev/shm rw,nosuid,nodev shared:4 - tmpfs tmpfs rw

Any ideas?