1. Uninstall cupswrapper:

1. Comment out the lines which include "lpadmin" from:
   /var/lib/dpkg/info/cupswrapper[model name].prerm
   /var/lib/dpkg/info/cupswrepper[model name].postinst
    
2. Uninstall cupswrapper
   dpkg -r cuprwrapper[model name]
   dpkg --purge cupswrapper[model name]

2. Modify the package:

1. Unpack the package
   dpkg --unpack cupswrapper[model name].[version].dpkg
    
2. Open /usr/local/Brother/cupswrapper/cupswrapper[model name] to edit.
3. Look for the line with "lpadmin -p [model name] -E -v .......".
4. Change "-m" to "-P" in the line
5. Add the file-path of the PPD file written in the line.
   the file path = "/usr/share/cups/model/"

Example.

BEFORE (Type the whole command as a single line before hitting enter).:
lpadmin -p MFC9420CN -E -v usb:/dev/usb/lp0 -m brmfc9420cn.ppd
AFTER (Type the whole command as a single line before hitting enter).:
lpadmin -p MFC9420CN -E -v usb:/dev/usb/lp0 -P /usr/share/cups/model/brmfc9420cn.ppd

*** if you use Debian and it doesn't have lpadmin, please delete the whole line which refers to lpadmin.

3. Run the install script

1. dpkg --configure cupswrapper[model name].[version].dpkg
   
   *** if you deleted the line about lpadmin, access http://localhost:631/printers
   click "Add printer" and follow the instructions to install.