....
Is it easier to change color depth in regular ubuntu?
no, i think it's the same, all depends on your video card and if the driver has a config utility, otherwise you'll be editing the xorg.conf.
you probably have a low end graphic card. but none the less, video config always aggravated me in linux. personally, i'm about to upgrade to an nvidia card just due to linux. my older ATI isn't cutting it, since ATI(AMD) isn't supporting an older card on the newer xorg.
i know you just went ubuntu, your text editor will now be "gedit" rather than "mousepad" , anyway, you had:
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
EndSection
*If* your video card supports it, you can edit that to:
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x1024" "1280x800" "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1280x1024" "1280x800" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
you can see i've only added two subsections, one for 24 bit, another for 16bit.
also, if you screen resolution cannot go to 1280x??? then delete those and stick with 1024x768 as the highest. then again, if it supports higher (or different) then put that instead. List highest to lowest.
also, if you botch your xorg.conf again, you can try the command "sudo dpkg-reconfigure xserver-xorg". it should get you to a base working xorg.
p.s. the only different between xubuntu and ubuntu is the Desktop GUI, and therefore some of the apps that run in it:
Xubuntu uses
http://www.xfce.org/ , and
Ubuntu uses
http://www.gnome.org/