I was quite happy after finding that I could get Maly’s scansnap S1300i working on my Ubuntu 18.04 install so here are my notes. The reference I used is here: https://www.gaggl.com/2016/11/getting-fujitsu-scansnap-s1300i-to-work-on-ubuntu-16-04lts/

First plugin your scansnap to your system via usb and then run these commands.

sudo apt update
sudo apt install sane tesseract-ocr
sudo usermod -a -G scanner yourusername
sudo sane-find-scanner
scanimage -L
device `epjitsu:libusb:002:011' is a FUJITSU ScanSnap S1300i scanner
sudo ldconfig -v | grep libsane

install driver 1300i_0D12.nal which can be downloaded from here:
https://www.josharcher.uk/code/install-scansnap-s1300-drivers-linux/

sudo mkdir /usr/share/sane/epjitsu
cd /usr/share/sane/epjitsu
sudo wget https://www.josharcher.uk/static/files/2016/10/1300i_0D12.nal

create the file

sudo vi /etc/udev/rules.d/79-scanner.rules

with the following contents:

Fujitsu ScanSnap S1300i
ATTRS{idVendor}=="04c5", ATTRS{idProduct}=="128d", MODE="0664", GROUP="scanner", ENV{libsane_matched}="yes"

Next install a basic gnu scanner to pdf utility.

sudo apt install gscan2pdf
gscan2pdf

I also picked up a copy of Master PDF Editor for $69.95 which works very well on Ubuntu 18.04 and can be used to control the scanner instead of using gscan2pdf for normal 8.5 x 11 pages.
https://code-industry.net/masterpdfeditor/