How do I reinstall bash in Ubuntu?

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http://serverfault.com – bash seems to be throwing a segfault, and my system is very broken. I was thinking of trying to reinstall bash instead of reinstalling the whole OS, but this is nontrivial apparently. I can't use apt-get because my network connection isn't connected (apparently due to bash being broken...?) So I booked a recovery disk and downloaded the deb file for it - but I can't do dpkg - it says this: # dpkg -i bash_4.1-2ubuntu3_i386.deb Selecting previously deselected package bash. (Reading database ... 22385 files and directories currently installed.) Preparing to replace bash 4.1-2ubuntu3 (using ba (HowTos)