>> Getting sudo access
myuser@myusers-vubuntu:~$ sudo -s
root@myusers-vubuntu:~# 

>> Looking up ubuntu version
root@myusers-vubuntu:~# lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 14.04.2 LTS
Release:	14.04
Codename:	trusty

>> User name is "myuser" on this machine, adding user myuser to group plugdev
root@myusers-vubuntu:~# gpasswd -a myuser plugdev

>> Adding an udev rule
root@myusers-vubuntu:~# echo "KERNEL==\"hidraw*\", SUBSYSTEM==\"hidraw\", ATTRS{idVendor}==\"16d0\", ATTRS{idProduct}==\"09a0\", MODE=\"0664\", GROUP=\"plugdev\"" > /etc/udev/rules.d/50-mooltipass.rules

>> Note: some users reported that the above rule was not working for them. If that is the case for you, you may try:
root@myusers-vubuntu:~# echo "ATTRS{idVendor}==\"16d0\", ATTRS{idProduct}==\"09a0\", SYMLINK+=\"mooltipass\", MODE=\"0664\", GROUP=\"plugdev\"" > /etc/udev/rules.d/50-mooltipass.rules

>> Reloading the rules
root@myusers-vubuntu:~# udevadm control --reload-rules

>> Unplug and replug your device and restart chrome

>> If the Mooltipass App still flickers or doesn't see the Mooltipass device, try logging off and logging back.

Notes:

1) If you have Trisquel Linux the above rule might not work for your system. You may find the correct matches by plugging in my Mooltipass and executing the following:
$ sudo udevadm info --name=/dev/usb/hiddev0 --attribute-walk
There will be several sections of output produced by the above command. Find the interesting section by looking for a line that references "Mooltipass" (i.e. ATTRS{product}=="Mooltipass"). Remove any matches that don't make sense on your system and replace them with attributes which do.
Don't forget to restart your scripts after updating the .rules file before unplugging, and reconnecting your Mooltipass:
$ sudo udevadm control --reload-rules

2) If you have archlinux, the correct udev rule follows:
KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="16d0", ATTRS{idProduct}=="09a0", MODE="0664", TAG+="uaccess"
For libusb access:
SUBSYSTEM=="usb", ATTRS{idVendor}=="16d0", ATTRS{idProduct}=="09a0", TAG+="uaccess"

3) If you have fedora, a correct udev rule follows:
echo "ATTRS{idVendor}==\"16d0\", ATTRS{idProduct}==\"09a0\", SYMLINK+=\"mooltipass\", MODE=\"0664\", GROUP=\"$USER\"" | sudo tee /etc/udev/rules.d/50-mooltipass.rules