由于我dpkg-query -L libc6无法在我的计算机上工作，因此无法安装任何软件包。
# apt-cache policy libc6
libc6:
Installed: 2.15-0ubuntu10.15
Candidate: 2.15-0ubuntu10.17
Version table:
2.15-0ubuntu10.17 0
500 http://archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
*** 2.15-0ubuntu10.15 0
100 /var/lib/dpkg/status
2.15-0ubuntu10 0
500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
# apt-cache policy libc6
libc6:
Installed: 2.15-0ubuntu10.15
Candidate: 2.15-0ubuntu10.17
Version table:
2.15-0ubuntu10.17 0
500 http://archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
*** 2.15-0ubuntu10.15 0
100 /var/lib/dpkg/status
2.15-0ubuntu10 0
500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following extra packages will be installed:
libc6 libc6-dbg libc6-dev libc6-dev-i386 libc6-i386
Suggested packages:
glibc-doc
The following packages will be upgraded:
libc6 libc6-dbg libc6-dev libc6-dev-i386 libc6-i386
5 upgraded, 0 newly installed, 0 to remove and 46 not upgraded.
4 not fully installed or removed.
Need to get 0 B/16.0 MB of archives.
After this operation, 13.3 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
Preconfiguring packages ...
(Reading database ... 792434 files and directories currently installed.)
Preparing to replace libc6:amd64 2.15-0ubuntu10.15 (using .../libc6_2.15-0ubuntu10.17_amd64.deb) ...
dpkg: error processing /var/cache/apt/archives/libc6_2.15-0ubuntu10.17_amd64.deb (--unpack):
subprocess new pre-installation script returned error exit status 2
Errors were encountered while processing:
/var/cache/apt/archives/libc6_2.15-0ubuntu10.17_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
现在，为了深入研究该问题，我从 /var/cache/apt/archives/libc6_2.15-0ubuntu10.17_amd64.deb 中提取了 preinst 脚本，并使用 ./preinst upgrade 2.15-0ubuntu10.15 运行它，结果显示存在问题
# dpkg-query -L libc6
dpkg-query: error: --listfiles needs a valid package name but 'libc6' is not: ambiguous package name 'libc6' with more than one installed instance
Use --help for help about querying packages.
显示已安装的软件包：
# dpkg -l libc6
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-=====================================================-===============================-===============================-===============================================================================================================
ii libc6:amd64 2.15-0ubuntu10.15 amd64 Embedded GNU C Library: Shared libraries
rc libc6:i386 2.15-0ubuntu10.15 i386 Embedded GNU C Library: Shared libraries
尝试使用以下命令删除所有 i386 软件包：
aptitude purge `dpkg --get-selections | grep ":i386" | awk '{print $1}'`
不幸的是，问题仍然存在，dpkg -l libc6仍然显示 i386 架构。
现在我陷入困境。有什么想法吗？
答案1
通过以下步骤以某种方式修复了此问题：
aptitude download libc6
mkdir tmp
dpkg-deb -R libc6_2.15-0ubuntu10.17_amd64.deb tmp
# edit DEBIAN/preinst replaced 'dpkg-query -L libc6' with 'dpkg-query -L libc6:amd64'
dpkg-deb -b tmp libc6_2.15-0ubuntu10.17fixed_amd64.deb
dpkg -i libc6_2.15-0ubuntu10.17fixed_amd64.deb
现在我能够解决冲突了。要摆脱我现在使用的所有 i386 软件包，请执行以下操作：
dpkg -l | grep :i386 | awk '{ print $2 }' | xargs dpkg -P
现在看来我已经摆脱了 i386 包：
dpkg -l libc6
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-=====================================================-===============================-===============================-===============================================================================================================
ii libc6:amd64 2.15-0ubuntu10.17 amd64 Embedded GNU C Library: Shared libraries