互換性の問題で以前のバージョンのgccとg ++（4.6.3）をインストールしてみましたが、今はaptが壊れているようです。 apt-get installはdpkgだけでなく、すべてのものに対してこれを行うようです。
>> sudo apt-get install dpkg
Reading package lists..
Done
Building dependency tree
Reading state information...
Done
dpkg is already the newest version. 0 upgraded, 0 newly installed, 0 to
remove and 0 not upgraded. 1 not fully installed or removed. After this
operation, 0 B of additional disk space will be used. Do you want to
continue? [Y/n]
「Y」を選択すると、常に次のような結果になります。
Setting up gcc (4:4.8.2-1ubuntu6) ...
update-alternatives: error: alternative path /usr/bin/gcc doesn't exist
dpkg: error processing package gcc (--configure):
subprocess installed post-installation script returned error exit status 2
E: Sub-process /usr/bin/dpkg returned an error code (1)
gcc 4.6.3をインストールしようとしたときに設定スクリプトを実行しましたが、おそらく--targetオプションに無効な値が指定された可能性があります。私は成功せず、次のようなさまざまな組み合わせを試しました。
apt-get update && apt-get upgrade
apt-get install -f
sudo dpkg --configure -a
apt-get remove/purge/autoremove gcc
さらに、Synapticは破損した包装がないと主張しています。
ご提案いただきありがとうございます。
編集：コメントに応じて
>> sudo apt-get purge gcc
[sudo] password for user:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
gcc*
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 42.0 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 278757 files and directories currently installed.)
Removing gcc (4:4.8.2-1ubuntu6) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
>> sudo dpkg -C
The following packages are only half configured, probably due to problems
configuring them the first time. The configuration should be retried using
dpkg --configure <package> or the configure menu option in dselect:
gcc GNU C compiler
依存関係に関する苦情で次のいずれかを削除しようとすると失敗します。
>> sudo dpkg --get-selections | grep gcc
gcc install
gcc-4.6 install
gcc-4.6-base:amd64 install
gcc-4.8 install
gcc-4.8-base:amd64 install
gcc-4.9-base:amd64 install
libgcc-4.8-dev:amd64 install
libgcc1:amd64 install
>> sudo dpkg --configure -a
Setting up gcc (4:4.8.2-1ubuntu6) ...
update-alternatives: error: alternative path /usr/bin/gcc doesn't exist
dpkg: error processing package gcc (--configure):
subprocess installed post-installation script returned error exit status 2
Errors were encountered while processing:
gcc
>> sudo dpkg -P gcc-4.9-base gcc-4.8-base gcc-4.8 1> command.out
dpkg: dependency problems prevent removal of gcc-4.9-base:amd64:
libgcc1:amd64 depends on gcc-4.9-base (= 4.9.1-0ubuntu1).
dpkg: error processing package gcc-4.9-base:amd64 (--purge):
dependency problems - not removing
dpkg: dependency problems prevent removal of gcc-4.8-base:amd64:
libitm1:amd64 depends on gcc-4.8-base (= 4.8.2-19ubuntu1).
libgomp1:amd64 depends on gcc-4.8-base (= 4.8.2-19ubuntu1).
libstdc++6:amd64 depends on gcc-4.8-base (= 4.8.2-19ubuntu1).
libgfortran3:amd64 depends on gcc-4.8-base (= 4.8.2-19ubuntu1).
libasan0:amd64 depends on gcc-4.8-base (= 4.8.2-19ubuntu1).
libgcc-4.8-dev:amd64 depends on gcc-4.8-base (= 4.8.2-19ubuntu1).
libtsan0:amd64 depends on gcc-4.8-base (= 4.8.2-19ubuntu1).
libquadmath0:amd64 depends on gcc-4.8-base (= 4.8.2-19ubuntu1).
libstdc++-4.8-dev:amd64 depends on gcc-4.8-base (= 4.8.2-19ubuntu1).
cpp-4.8 depends on gcc-4.8-base (= 4.8.2-19ubuntu1).
libatomic1:amd64 depends on gcc-4.8-base (= 4.8.2-19ubuntu1).
dpkg: error processing package gcc-4.8-base:amd64 (--purge):
dependency problems - not removing
dpkg: warning: ignoring request to remove gcc-4.8 which isn't installed
Errors were encountered while processing:
gcc-4.9-base:amd64
gcc-4.8-base:amd64
>> sudo dpkg -P gcc-4.6 gcc-4.6-base
dpkg: dependency problems prevent removal of gcc-4.6:
g++-4.6 depends on gcc-4.6 (= 4.6.4-6ubuntu2).
dpkg: error processing package gcc-4.6 (--purge):
dependency problems - not removing
dpkg: dependency problems prevent removal of gcc-4.6-base:amd64:
gcc-4.6 depends on gcc-4.6-base (= 4.6.4-6ubuntu2).
libstdc++6-4.6-dev depends on gcc-4.6-base (= 4.6.4-6ubuntu2).
g++-4.6 depends on gcc-4.6-base (= 4.6.4-6ubuntu2).
cpp-4.6 depends on gcc-4.6-base (= 4.6.4-6ubuntu2).
dpkg: error processing package gcc-4.6-base:amd64 (--purge):
dependency problems - not removing
Errors were encountered while processing:
gcc-4.6
gcc-4.6-base:amd64