display resolution

What is the output of:

sudo lshw -C display; lsb_release -a; uname -a; xrandr

Thanks

 *-display
       description: VGA compatible controller
       product: SVGA II Adapter
       vendor: VMware
       physical id: f
       bus info: pci@0000:00:0f.0
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: vga_controller bus_master cap_list rom
       configuration: driver=vmwgfx latency=64
       resources: irq:16 ioport:1070(size=16) memory:e8000000-efffffff memory:fe000000-fe7fffff memory:c0000-dffff
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 17.10
Release: 17.10
Codename: artful
Linux ubuntu 4.13.0-35-generic #39-Ubuntu SMP Mon Feb 12 11:06:39 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 8192 x 8192
XWAYLAND0 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1920x1200 59.86*+

Oh are you running Ubuntu in a virtual PC using Vmware?

Yes, I do!

Why wasn't that in the original question?

Your monitor is absolutely moot here, the hardware you are using is virtual.

You need to install the VMWare tools
https://kb.vmware.com/s/article/1022525