I recently reinstalled Oneric/ia64 on a few machines because of the recently included gcc-arm packages which always were a pain to self-compile.

I added a http-proxy (squid) on my local fileserver/NAS and used the netinstall through that proxy: No duplicate downloads, up to date packages for everything and I could start installing without waiting for the .ISO to finish downloading.

I highly recommend that method, and it should work for most distributions out there, possibly even for WindowsUpdate ;-)

Cables don't get "old" by themselves, but they might have been installed incorrectly from the start (too tight bending, swapped pairs/cables, twisted pairs separated for a longer distance, shields not connected properly, grounding done wrong). Furthermore mechanical stress (too much work being done on a patch panel over the course of several years, cables pulled hard while moving racks, ...) might have damaged parts of the cabling.

To cut a long story short: Properly done CAT5 should be good enough for Gigabit, but often what's called CAT5 works well for 100 Mbit networks even though it doesn't meet the specs.

Get a decent LAN tester (not just two computers, using "ping") that prints out attenuation, crosstalk and all the other things... and preferably tells you what "category" your cabling still is compatible with. Replace all the stuff that's out of spec. Then you have hard numbers you can rely on should you ever ponder if your local network infrastructure can handle 100M/1G/10G bit/s. Everything else is guesswork.

And if you really need elevated privileges, there's a proven mechanism (suid) that's been working for quite a while. Of course, you can have security holes that way, but at least the fundamental problems (like messing around with the elevated process) have been solved for ages...

aufgebohrt means pimped. So they used a laptop and a improved version of the DECT card.

That is fine for me, because as long as I cannot hear sounds at 48kHz or higher, a square- and a sine-wave of 16 kHz are identical! (see e.g. here: http://cnx.org/content/m0041/latest/)

You forget Godel, who proved that any system like mathemetics is based on non-provable axioms. So you cannot say that mathematics has been proven to be true... There are some axioms at the base which are not provable, but from then on it is everything fine.