In my case 'gksu-cups-add' detected two ppds for ach driver tested (the gzipped and the gunzipped). e.g.:
** (gnome-cups-add:6359): WARNING **: Two ppds have driver == 'Standard' ->linuxprinting.org-postscript/Savin/Savin-SLP26n_PS.ppd.gz (Savin SLP26n PS[0]) and ->linuxprinting.org-gs-builtin/Savin/Savin-SLP26n-Postscript.ppd (Savin SLP26n PS)[0]
** (gnome-cups-add:6359): WARNING **: Two ppds have driver == 'Standard' ->linuxprinting.org-postscript/Savin/Savin-SLP32_PS.ppd.gz (Savin SLP32 PS[0]) and ->linuxprinting.org-gs-builtin/Savin/Savin-SLP32-Postscript.ppd (Savin SLP32 PS)[0]
** (gnome-cups-add:6359): WARNING **: Two ppds have driver == 'Standard' ->linuxprinting.org-postscript/Savin/Savin-SLP38c_PS.ppd.gz (Savin SLP38c PS[0]) and ->linuxprinting.org-gs-builtin/Savin/Savin-SLP38c-Postscript.ppd (Savin SLP38c PS)[0]
** (gnome-cups-add:6359): WARNING **: Two ppds have driver == '1.2' ->linuxprinting.org-postscript/Sharp/shc260mj.ppd.gz (Sharp AR-C260M PS, 1.2[0]) and ->linuxprinting.org-postscript/Sharp/shac260m.ppd.gz (Sharp AR-C260M PS, 1.2)[0]
In my case 'gksu-cups-add' detected two ppds for ach driver tested (the gzipped and the gunzipped). e.g.:
** (gnome- cups-add: 6359): WARNING **: Two ppds have driver == 'Standard'
->linuxprintin g.org-postscrip t/Savin/ Savin-SLP26n_ PS.ppd. gz (Savin SLP26n PS[0]) and
->linuxprintin g.org-gs- builtin/ Savin/Savin- SLP26n- Postscript. ppd (Savin SLP26n PS)[0]
** (gnome- cups-add: 6359): WARNING **: Two ppds have driver == 'Standard'
->linuxprintin g.org-postscrip t/Savin/ Savin-SLP32_ PS.ppd. gz (Savin SLP32 PS[0]) and
->linuxprintin g.org-gs- builtin/ Savin/Savin- SLP32-Postscrip t.ppd (Savin SLP32 PS)[0]
** (gnome- cups-add: 6359): WARNING **: Two ppds have driver == 'Standard'
->linuxprintin g.org-postscrip t/Savin/ Savin-SLP38c_ PS.ppd. gz (Savin SLP38c PS[0]) and
->linuxprintin g.org-gs- builtin/ Savin/Savin- SLP38c- Postscript. ppd (Savin SLP38c PS)[0]
** (gnome- cups-add: 6359): WARNING **: Two ppds have driver == '1.2'
->linuxprintin g.org-postscrip t/Sharp/ shc260mj. ppd.gz (Sharp AR-C260M PS, 1.2[0]) and
->linuxprintin g.org-postscrip t/Sharp/ shac260m. ppd.gz (Sharp AR-C260M PS, 1.2)[0]