???Error at loading of the information on sources of appendices.

The problem has dared very simply!
1. Has come in UBUNTU TWEAK;
2. Has opened "system clearing";
3. Has pressed the button "Clearing PPAs";
4. Has removed doubtful PPA

https://launchpad.net/~ferramroberto is organising his packages in an non-standard archive layout. He is the source of your grief. There is no extra archive that has maverick packages.
    https://launchpad.net/~ferramroberto/+archive/extra

~ferramroberto appears to have created a separate archive for just maverick packages.
    https://launchpad.net/~ferramroberto/+archive/maverickextra

I image that your updates will break again when you got to the next version of Ubuntu.

Thank you very much)
Is really there a big necessity for erroneous updating???

That apt-get/Ubuntu's update manager are responsible for that. Ubuntu does the right thing when during upgrades by updates the versions needed from archives. Ubuntu requires users need to update what it know known. Since ~ferramroberto is not doing what Ubuntu expects, only experiences users can solve what went wrong.

Whether correctly I have understood you is an updating it is necessary to establish back? And how long it is necessary to suffer this error?

The problem is really between you and the owner of the PPA.

You can contact the owner the the PPA and explain that he is not managing his archive like Ubuntu and Debain expects, which breaks upgrades. He may fix the issue by publishing multiple packages for different Ubuntu releases to the *same* PPA

You can remove the PPA from Update Manager source now and there will no more errors.

Thank you very much for support! Packages were established, errors aren't present! Excuse for superfluous whims)) Good luck to you! Большое Спасибо!