Setup MFC-7345N Scanner

I have a MFC-7345N 3-in-1 printer/scanner/fax, which was initially setup with a IP address of 192.96.96.199. Later on the IP address was changed to 192.168.0.199. The PC machines adapt to the change easily, but Ubuntu machines got stuck.
Here's how I re-setup my MFC-7345N scanner under Ubuntu.

• check if the system is 32bit or 64bit: uname -a
• download brscan3-0.2.11-5.amd64.deb and brscan-skey-0.2.4-1.amd64.deb
• install package: sudo dpkg -i --force-all brscan3-0.2.11-5.amd64.deb brscan-skey-0.2.4-1.amd64.deb
• check if the scanner model is supported, if not, choose a closer one:  brsaneconfig3 -q
• configure the scanner: sudo brsaneconfig3 -a name=SCANNER model=MFC-7440N ip=192.168.0.199
• check setup: brscan-skey -l
• use gscan2pdf to scan

official instruction:

http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/instruction_scn1b.html#config1

for ubuntu 18.04, needs to do:
For 64bit Users:
Command : sudo cp /usr/lib64/sane/libsane-brother* /usr/lib/x86_64-linux-gnu/sane

For 32bit Users:
Command : sudo cp /usr/lib/sane/libsane-brother* /usr/lib/i386-linux-gnu/sane