debian的高手帮忙啊：如何升级软件包？

luogf

我刚装了一个debian，在上面装pure-ftpd+数据库时要求升级libpam0g-0.72-35到libpam0g (>;= 0.76)，libc6.1-2.2.5-11.5到 libc6.1 (>;= 2.3.1-1)，请问怎么升级啊，

我的sources.list如下：
deb ftp://ftp.debian.org/debian/ stable main
deb-src ftp://ftp.debian.org/debian/ stable main
deb http://non-us.debian.org/debian-non-US stable/non-US main
deb-src http://non-us.debian.org/debian-non-US stable/non-US main

deb http://security.debian.org/ stable/updates main

通过
#apt-get update
#apt-get -u install libc6.1却告诉我：
debian:~# apt-get -u install libpam0g
Reading Package Lists... Done
Building Dependency Tree... Done
Sorry, libpam0g is already the newest version.
0 packages upgraded, 0 newly installed, 0 to remove and 0  not upgraded.

通过
#apt-cache showsrc
Package: glibc
Binary: libc6.1-dev, libc0.3-dbg, libc0.3-pic, libc6-dbg, libc6-dev-sparc64, locales, libc0.3-dev, nscd, libc6.1-prof, libc6-pic, libc0.3-prof, glibc-doc, libc6-dev, libc0.3, libc6-prof, libc6, libc6-sparc64, libc6.1, libc6.1-dbg, libc6.1-pic
Version: 2.2.5-11.2
Priority: required
Section: devel
Maintainer: Ben Collins <bcollins@debian.org>;
Build-Depends: gettext (>;= 0.10.37-1), make (>;= 3.78-4), dpkg-dev (>;= 1.4.1.5), debianutils (>;= 1.13.1), tar (>;= 1.13.11), bzip2, texinfo (>;= 4.0), kernel-headers-2.4 [!hurd-i386], mig [hurd-i386], hurd-dev [hurd-i386], gnumach-dev [hurd-i386], texi2html, file, gcc-3.0 [sparc], autoconf
Build-Depends-Indep: perl, latex2html
Build-Conflicts: gcc-2.95 (<< 1:2.95.3- [!i386], gcc-2.95 (<< 1:2.95.3-9) [i386], kernel-headers-2.4.18-sparc [!sparc]
Architecture: any
Standards-Version: 3.1.1
Format: 1.0
Directory: pool/main/g/glibc
Files:
cc651d09cfc7f6430af8ef1151b5eebb 1203 glibc_2.2.5-11.2.dsc
bf5653fdff22ee350bd7d48047cffab9 11370961 glibc_2.2.5.orig.tar.gz
4b7aa7f079f6ad37916c46479f741b9f 397057 glibc_2.2.5-11.2.diff.gz


有没有知道怎么更新啊？

fscyr

apt-get upgrade