質問させてください
aptitude updateするとエラーが出ます
ほかにもinstallでもエラーが出ます
直す方法教えてください

root:# aptitude update
Get:1 http://ftp.jp.debian.org stable Release.gpg [386B]
Hit http://ftp.jp.debian.org stable Release
Ign http://ftp.jp.debian.org stable/main Packages/DiffIndex
Ign http://ftp.jp.debian.org stable/non-free Packages/DiffIndex
Ign http://ftp.jp.debian.org stable/main Sources/DiffIndex
Hit http://ftp.jp.debian.org stable/main Packages
Hit http://ftp.jp.debian.org stable/non-free Packages
Hit http://ftp.jp.debian.org stable/main Sources
Get:2 http://security.debian.org stable/updates Release.gpg [189B]
Hit http://security.debian.org stable/updates Release
Ign http://security.debian.org stable/updates/main Packages/DiffIndex
Hit http://security.debian.org stable/updates/main Packages
Fetched 2B in 1s (1B/s)
Reading package lists... Error!
E: Read error - read (5 Input/output error)
E: The package lists or status file could not be parsed or opened.
E: Couldn't rebuild package cache