Comment 7 for bug 566788

Same problem, after upgrading to Lucid and when installing a new version of chromium. Downgrading chromium didn't solve the problem.

$ chromium-browser
[5094:5094:10359541725:FATAL:base/shared_memory_posix.cc(193)] Creating shared memory in /dev/shm/org.chromium.DyN5DD failed. This is frequently caused by incorrect permissions on /dev/shm. Try 'sudo chmod 777 /dev/shm' to fix.: No such file or directory
Aborted

$ ls -ld /dev/shm/
drwxr-xr-t 2 root root 40 2007-10-05 18:45 /dev/shm/
$ grep shm /proc/self/mountinfo
24 17 0:16 / /dev/shm rw,nosuid,nodev,relatime - tmpfs none rw
$ grep shm /lib/init/fstab
none /dev/shm tmpfs nosuid,nodev 0 0

$ added in /etc/fstab with the options: nosuid,nodev,noexec,mode=1777 and works.
Are this the most appropiate options?