If you are really using 2.6.0~pre you are on the bleeding edge and feeling the pain. The build-bot shows 2.5.0~pre. EMC2-2.4.6 is the latest stable release, 2.5 is coming soon.
If you go to Index of /dists/lucid/v2.5_branch-rt/binary-i386 you can download something like "emc2_2.5.0~pre1-476-ge01d33f_i386.deb". It should be getting close to stable.
I would suggest sticking with 2.4.6 unless you need features that are only in 2.5.
Alan