Ubuntu 20.04 misses printer, and correct monitor resolution

[Marco Fioretti]

Greetings,
I just installed Ubuntu 20.04 LTS on a linux-only desktop, and everything works except these
two things,for which I have not found usable/proper matches online.
Printing: the computer has attached an Epson XP-305 printer/scanner. As scanner, is detected
and works fine with simple-scan, and sane says:
#> sudo sane-find-scanner:
could not fetch string descriptor: Pipe error
could not fetch string descriptor: Pipe error
found USB scanner (vendor=0x04b8, product=0x0898) at libusb:001:005
could not fetch string descriptor: Pipe error
could not fetch string descriptor: Pipe error
As printer, it is detected, and shows up both in the CUPS web panel and in the Ubuntu
settings panel, as connected and working... but nothing happens. If I try to print a test
page from the Ubuntu settings,it says page sent, and after some seconds "test completed"
(IIRC) but NOTHING happens in the printer. If I try to print a self-test page from the CUPS web
panel, instead, I get:
  Unable to send command to printer driver:
 Not allowed to print.

What next?
The monitor is a samsung syncmaster 226BW, which has maximum resolution of 1680x1050.But during the installation maximum resolution was set at 1024x768, and the control panelhas no 1680x1050 option. I can get the maximum resolution with this shell script, that I adaptedfrom somewhere online years ago, when I had the same problem with another distro:
xrandr --newmode "1680x1050_60.00" 147.14  1680 1784 1968 2256  1050 1051 1054 1087  -HSync +Vsync
xrandr --addmode HDMI-0 "1680x1050_60.00"
xrandr --output HDMI-0 --mode "1680x1050_60.00"

and of course this patch only lasts as long as the session. How to make the change permanent,and make Ubuntu remember the correct max resolution for this monitor? I know I could add thelines above to .Xsession or similarf iles, but isn't there a... more modern solution?
TIA,Marco
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