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The Shared Memory Device /dev/shm,shm = shared memory) is disabled since version 2.3 on IPFire. Some Addons such as Qemu uses */dev/shm. If multiple VMs run at the same time you should adapt the size of */dev/shm accordingly.
Loggon to IPFire directly or via SSH, and change the following line in /etc/fstab"
shm /dev/shm tmpfs default 0 0
shm /dev/shm tmpfs size=528m 0 0
After restarting the IPFire or remount the device the size of shared memory is raised up to 512 MB.
to remount the device type
mount -o remount /dev/shm