Comment 5 for bug 1529105

Same issue here (Ubuntu 16.04.3 LTS, X.Org X Server 1.19.3)

Quick and dirty remedy:
=======================

Download this package:
   xserver-xorg-input-aiptek_1.4.1-2build1_amd64.deb

In packag control file, changed the following line (by ar/tar/... tools):
Depends: libc6 (>= 2.4), xorg-input-abi-24, xserver-xorg-core (>= 2:1.18.99.901)
to
Depends: libc6 (>= 2.4), xorg-input-abi-24, xserver-xorg-core-hwe-16.04 (>= 2:1.19.3)

then install the modified local package:
sudo dpkg -i xserver-xorg-input-aiptek_1.4.1-2build1_amd64.deb

$ apt list --installed | grep aiptek

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

xserver-xorg-input-aiptek/now 1:1.4.1-2build1 amd64 [installed,local]

$ sudo modprobe aiptek
$ xinput
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Dell Dell Wired Multimedia Keyboard id=9 [slave pointer (2)]
⎜ ↳ SIGMACHIP Usb Mouse id=10 [slave pointer (2)]
⎜ ↳ Aiptek id=11 [slave pointer (2)]
.
.
$ grep aiptek /var/log/Xorg.0.log
[ 35.656] (II) LoadModule: "aiptek"
[ 35.657] (II) Loading /usr/lib/xorg/modules/input/aiptek_drv.so
[ 35.664] (II) Module aiptek: vendor="X.Org Foundation"
[ 35.664] (II) Using input driver 'aiptek' for 'Aiptek'
[ 35.680] (II) Able to open aiptek device

Add proper 50-aiptek.conf in /usr/share/X11/xorg.conf.d

Tested in myPaint and Gimp, my G-pen 560 tablet works well.

(Unfortunately in Unity there is no tablet pointer visible outside the drawing window on the screen, but I believe that is a Unity issue. In Gnome3 tablet operation is correct.)

I hope It helps others too.