Ubuntu Installation :: Clamd Error On Start - Unable To Execute Setgroups

I have problem starting clamd. It's unable to execute setgroups()
/etc/group , /etc/password files are world readable
Here is output after starting clamd:
sudo clamd
ERROR: setgroups() failed.

Here is strace clamd output:
...
open("/etc/passwd", O_RDONLY|0x80000 /* O_??? */) = 3
fcntl64(3, F_GETFD) = 0x1 (flags FD_CLOEXEC)
_llseek(3, 0, [0], SEEK_CUR) = 0
fstat64(3, {st_mode=S_IFREG|0644, st_size=1616, ...}) = 0
mmap2(NULL, 1616, PROT_READ, MAP_SHARED, 3, 0) = 0xb7f6d000
_llseek(3, 1616, [1616], SEEK_SET) = 0

munmap(0xb7f6d000, 1616) = 0
close(3) = 0
setgroups32(1, [120]) = -1 EPERM (Operation not permitted)
write(2, "ERROR: setgroups() failed.
", 27ERROR: setgroups() failed.) = 27
exit_group(1) = ?
Process 29002 detached

ls -al /etc/group:
-rw-r--r-- 1 root root 1013 2010-03-19 11:38 /etc/group
ls -al /etc/passwd:
-rw-r--r-- 1 root root 1616 2010-03-05 12:39 /etc/passwd
/etc/passwd:
clamav:x:108:120::/var/lib/clamav:/bin/false
/etc/group:
clamav:x:120: