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hockey_steve@ThinkCentre:~/Downloads$ sudo dpkg -i *.deb
dpkg: error: dpkg frontend lock is locked by another process
hockey_steve@ThinkCentre:~/Downloads$ sudo apt install gdebi
Waiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend. It is heWaiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend. It is heWaiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend. It is heWaiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend. It is heWaiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend. It is heWaiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend. It is heWaiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend. It is he
Only one installer can run at a time.
Close any Open Installation attempts. Ensure that Synaptic or Software Store is not open.
Open One Terminal
cd ~/Downloads
sudo dpkg -i *deb
This will install the packages.
Once done, you can run
sudo apt install gdebi
In order to have it on your system.
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This didn't work
hockey_steve@ThinkCentre:~/Downloads$ gunzip linux-brprinter-installer-2.2.3-1.gz
gzip: linux-brprinter-installer-2.2.3-1.gz: not in gzip format
I think you'd be better off to install scanner (and Fax if you need) driver from .deb file.
Blockquote
i think Aravisian may have solved the problem:
ockey_steve@ThinkCentre:~/Downloads$ sudo dpkg -i *deb
[sudo] password for hockey_steve:
Selecting previously unselected package brscan4.
(Reading database ... 273383 files and directories currently installed.)
Preparing to unpack brscan4-0.4.10-1.amd64.deb ...
Unpacking brscan4 (0.4.10-1) ...
Setting up brscan4 (0.4.10-1) ...
This software is based in part on the work of the Independent JPEG Group.
hockey_steve@ThinkCentre:~/Downloads$ sudo apt install gdebi
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
Is there a next step? I rebooted the printer, but still can't scan.
If the scanner driver is installed, all you need it to add it to the Document Scanner:
It's not detecting the scanner 
Can you reboot your system, not just a scanner/printer?
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Almost afraid to, but I'll get back to you on the other side.
Did you press Return key to finish installation after this?
Still not detecting the scanner.
I'm sure I hit enter after the process ran.
I just re-ran it and got this:
hockey_steve@ThinkCentre:~/Downloads$ sudo dpkg -i *deb
[sudo] password for hockey_steve:
(Reading database ... 289152 files and directories currently installed.)
Preparing to unpack brscan4-0.4.10-1.amd64.deb ...
Unpacking brscan4 (0.4.10-1) over (0.4.10-1) ...
Setting up brscan4 (0.4.10-1) ...
This software is based in part on the work of the Independent JPEG Group.
hockey_steve@ThinkCentre:~/Downloads$ sudo apt install gdebi
Reading package lists... Done
Building dependency tree
Reading state information... Done
gdebi is already the newest version (0.9.5.7+nmu3).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded
Please download this file.
https://support.brother.com/g/b/downloadend.aspx?c=us&lang=en&prod=mfcj5620dw_us_eu&os=128&dlid=dlf105200_000&flang=4&type3=566
Then double click on it to install with gdebi.
brscan4-0.4.10-1.amd64.deb
Don't know if it counts.. but is it really necessary to add a printer to the system by using Settings - Printers .... because what if you don't, won't it show?
That's why I recommended to install from the terminal with installer script at the beginning. This script will install printer/scanner/fax all in one go.
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Can you download this driver and install it with gdebi?
https://support.brother.com/g/b/downloadend.aspx?c=us&lang=en&prod=mfcj5620dw_us_eu&os=128&dlid=dlf101194_000&flang=4&type3=559
Done
Still no scanner detected
The printer was added when I did the re-install of Zorin.
I wonder if I should delete the printer and the drivers and run the package install
I think there is no deed to remove printer driver.
But you could reboot and reinitialize your printer to see if it makes any difference.
I've rebooted the computer and the printer several times already.