bringing up X on minimal stretch install

[jegb]

Not sure why keyboard is not detected, I tried running your install_desktop.sh, and found few missing packages:
Package chromium-browser is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

Package gnomine is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
gnome-mines

E: Package 'gnomine' has no installation candidate
E: Package 'chromium-browser' has no installation candidate
E: Unable to locate package ubuntu-mate-core
E: Unable to locate package ubuntu-mate-desktop
E: Unable to locate package ubuntu-mate-lightdm-theme
E: Unable to locate package ubuntu-mate-wallpapers-xenial

Here are the devices enum list:
rock64@rock64:~$ cat /proc/bus/input/devices
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="rk8xx_pwrkey"
P: Phys=rk8xx_pwrkey/input0
S: Sysfs=/devices/platform/ff160000.i2c/i2c-1/1-0018/input/input0
U: Uniq=
H: Handlers=kbd event0
B: PROP=0
B: EV=3
B: KEY=10000000000000 0

I: Bus=0003 Vendor=046d Product=c063 Version=0110
N: Name="DELL DELL USB Laser Mouse"
P: Phys=usb-ff5c0000.usb-1.1/input0
S: Sysfs=/devices/platform/ff5c0000.usb/usb2/2-1/2-1.1/2-1.1:1.0/0003:046D:C063.0004/input/input2
U: Uniq=
H: Handlers=event1
B: PROP=0
B: EV=17
B: KEY=ff0000 0 0 0 0
B: REL=143
B: MSC=10