Ubuntu colors are orange and brown, and GNOME desktop envinroment in this OS designed exactly in that colors, but why Kubuntu's colors are blue and black? Why it have default KDE appereance, which are used in many other Linux distributions?

P.S.: Sorry for my worse English, i'm from Russia.

There should be an option to print images black/white in the KDE print dialog.

The GNOME print dialog has this feature - the KDE one just very hidden in the printer driver options.

I think that many people get confused by having separately named distros for Ubuntu's KDE version and GNOME version. Plus, they get confused by what exactly the difference is. Plus, they think that if they are so similar, why do they look so different.

When KDE desktop is shutting down (because of shutdown, restart, log out ...) it gives no visual feedback after the button is clicked that shutdown is in progress. It returns to desktop and for a few seconds it appears nothing is happening.

This creates confusion, it should at least darken screen to indicate shutdown is in progress.

Konqueror has been the Kubuntu default web browser since years. This is really a good web browser but it is not famous and a lot of web sites that uses browser identification fail and are not showed correctly in Konqueror. Konqueror has also a lot of rendering problems in some important sites as like as GMAil or Hotmail webmail.

Arora is a young web browser based in QtWebkit and Qt4 graphical interfaces. It ussually render well almost all web sites better than Konqueror and it has got a medium well integration in KDE due to Qt4 usage.
But Arora has still many functionalities missed and it has serious problems watching flash videos on some webs.

Rekonq is a young web browser based in QtWebkit and KDE4 graphical interfaces. It is very similar to Arora but it is much better well integrated in KDE.
It also has many functionalities missed but it is gifted with some KDE technnologies as like as downloading system or language translation support.
It seem to work better than Arora in flash playing.

Firefox is a well known web browser and it is surely currently the best rendering and complete web browser in the Software Libre world.
But is very bad integrated with KDE because it uses gtk graphical interfaces and it is also bad integrated with other technnologies as like as local file browsing and downloading system.

When an (usb) device is plugged in, the computer now only responds correctly if the right software is installed. For example, it might propose to import photos when a camera was attached or to sync music files when a mp3 player was connected.

But if this software is not installed, the computer does not know what to do with it and the user might not know what software to install.

In most cases, the user will know what to install, but it would be very handy if the computer would suggest a few drawing programs (Krita for example) when plugging in a tablet or if the computer would suggest to install spacenavd when a 3DConnexxion SpaceNavigator was installed.

The device list should probably be based on usb ids and not on device classes, because some cameras or mp3 players are recognised as hard drives, while they are more than that.

Firefox is a cross-platform, very versatile webrowser. I dont know why not include it by default on Kubuntu just along with konqueror, at least newcomers would be familiar with this software.

As written above, katapult should remember the commands used most often and offer those first when starting to type the command. Example:
Currently, when I want to start konqueror here is what I type in katapult and what programm is offered to be run:

k K3b
ko Kolf
kon Konsole
konq Konquest
konqu Konquest
konque Konquest
konquer Konqueror
...

Instead I think katapult should offer to start konqueror (in this example) from the first letter on (after I used katapult to start konquerer a few times of course).
I think it is very annoying to have to type 7 letters each and every time I want to start konqueror.

It is a frustration for new user to install software in Kubuntu, so I think it would be good to add some thing like software center to Kubuntu.

I use Kaffeine quite a lot, mainly to watch TV since my TV card seems to like it. Anyway, when I first started using and playing about with its settings I found that help wouldn't work - the message "Could not launch the KDE Help Center: Could not find service 'khelpcenter'." was displayed instead of a nice help menu.

This kind of thing shouldn't happen - it's very offputting to any new user to find that they can't access help from the program they're trying to use.

Hence I propose that the necessary packages to run KDE help are installed whenever a KDE app is installed in Gnome.