iPhone hang, Cydia crash, and apt-get bus error

I wanted to install a new application through Cydia today. When I tapped Cydia's Install button, though, Cydia and the entire iPhone froze. The usual power off button didn't work, and I couldn't ssh into it. Thankfully, other people knew how to power off and reboot a hung iPhone.

I tried to run Cydia again, and it crashed immediately. I tried to reinstall Cydia, but there was a seemingly bigger problem:

mirex:~ root# apt-get install cydia
Bus errorackage lists... 0%
mirex:~ root#

andreev2001 had a good suggestion, but it had the same result:

mirex:~ root# apt-get update
Get:1 http://apt.saurik.com tangelo Release.gpg [189B]
Get:2 http://www.zodttd.com stable Release.gpg [189B]
Hit http://www.zodttd.com stable Release
Hit http://apt.saurik.com tangelo Release
Get:3 http://modmyifone.com stable Release.gpg [189B]
Ign http://www.zodttd.com stable/main Packages/DiffIndex
Get:4 http://repo.smxy.org xena Release.gpg [189B]
Hit http://modmyifone.com stable Release
Ign http://apt.bigboss.us.com stable Release.gpg
Ign http://www.zodttd.com stable/main Packages
Get:5 http://apt.bigboss.us.com stable Release [147B]
Hit http://repo.smxy.org xena Release
Ign http://apt.saurik.com tangelo/main Packages/DiffIndex
Hit http://www.zodttd.com stable/main Packages
Ign http://apt.bigboss.us.com stable/main Packages/DiffIndex
Ign http://modmyifone.com stable/main Packages/DiffIndex
Ign http://apt.saurik.com tangelo/main Packages
Ign http://modmyifone.com stable/main Packages
Ign http://apt.bigboss.us.com stable/main Packages
Hit http://modmyifone.com stable/main Packages
Ign http://repo.smxy.org xena/main Packages/DiffIndex
Hit http://apt.saurik.com tangelo/main Packages
Get:6 http://apt.bigboss.us.com stable/main Packages [30.5kB]
Ign http://repo.smxy.org xena/main Packages
Hit http://repo.smxy.org xena/main Packages
Fetched 30.8kB in 3s (9145B/s)
Bus errorackage lists... 0%
mirex:~ root#

Fedor had the definitive solution:

mirex:~ root# rm /var/cache/apt/*.bin
mirex:~ root# apt-get update
Get:1 http://modmyifone.com stable Release.gpg [189B]
Ign http://apt.bigboss.us.com stable Release.gpg
Get:2 http://apt.saurik.com tangelo Release.gpg [189B]
Get:3 http://www.zodttd.com stable Release.gpg [189B]
Get:4 http://repo.smxy.org xena Release.gpg [189B]
Get:5 http://apt.bigboss.us.com stable Release [147B]
Hit http://apt.saurik.com tangelo Release
Hit http://repo.smxy.org xena Release
Hit http://www.zodttd.com stable Release
Ign http://apt.bigboss.us.com stable/main Packages/DiffIndex
Ign http://apt.saurik.com tangelo/main Packages/DiffIndex
Ign http://apt.saurik.com tangelo/main Packages
Ign http://repo.smxy.org xena/main Packages/DiffIndex
Ign http://apt.bigboss.us.com stable/main Packages
Ign http://www.zodttd.com stable/main Packages/DiffIndex
Hit http://apt.saurik.com tangelo/main Packages
Ign http://repo.smxy.org xena/main Packages
Get:6 http://apt.bigboss.us.com stable/main Packages [30.5kB]
Ign http://www.zodttd.com stable/main Packages
Hit http://repo.smxy.org xena/main Packages
Hit http://www.zodttd.com stable/main Packages
Hit http://modmyifone.com stable Release
Ign http://modmyifone.com stable/main Packages/DiffIndex
Ign http://modmyifone.com stable/main Packages
Hit http://modmyifone.com stable/main Packages
Fetched 30.8kB in 4s (7324B/s)
Reading package lists... Done
mirex:~ root#

Problem solved. Cydia ran properly again, and I installed the new application.