Create a backup of the defaults.ini file:
sudo cp /opt/google/picasa/3.0/wine/drive_c/Program\ Files/Google/
Picasa3/runtime/defaults.ini /opt/google/picasa/3.0/wine/drive_c/
Program\ Files/Google/Picasa3/runtime/defaults.ini.bak
Then edit the defaults.ini file with your editor of choice:
sudo vim /opt/google/picasa/3.0/wine/drive_c/Program\ Files/Google/
Picasa3/runtime/defaults.ini
replace the line -
printerURL=https://uploader.picasa.com/providers/wine/printers.php?
picasaversion=30
with this line -
printerURL=https://client4.google.com/providers/printers.html