canceling download in synamptic package manager caused problem

[DHRUV D. MEVADA]

i have serched ubuntustudio in synaptic and tired of my slow connection i
cancelled the download but some of the packages are downloaded there
properly so it tried to install them and then show errors.and after when i
reboot i found another entry in my grub loader like this:

ubuntu 8.04. kernal 2.6.24-21-rt
ubuntu 8.04. kernal 2.6.24-21-rt(recovery mode)
ubuntu 8.04. kernal 2.6.24-21-generic
ubuntu 8.04. kernal 2.6.24-21-generic(recovery mode)
..........................
other os.........(vista)

like this it has double entry. when i go to the entry -rt once it shows

b43-phy0 ERROR:firmware file "b43/4code13.fw" not found or load failed.

then i tried recovery mode found nothing and wen i again goes to the first
entry (mind that second entry(generic) works properly leaving not using my
nvidia graphics driver)it showed this error

Failed to start X Server(Your Graphical Interface)it is likely that it is
not setup correctly.would like to view the x server output to diagnose the
problem? next text i forget to write down

what can i do to remove this another entry?

Dhruv D. Mewada
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