我正在使用 Ubuntu 12.04.3 LTS，64 位，带有 gcc 4.6.3
我想将 gcc 更新到 4.7，然后按照链接说的做：
但我得到了错误：
Fetched 14.0 MB in 18s (767 kB/s)
(Reading database ... 205536 files and directories currently installed.)
Preparing to replace libgcc1 1:4.6.3-1ubuntu5 (using .../libgcc1_1%3a4.8.1-2ubuntu1~12.04_amd64.deb) ...
Unpacking replacement libgcc1 ...
dpkg: error processing /var/cache/apt/archives/libgcc1_1%3a4.8.1-2ubuntu1~12.04_amd64.deb (--unpack):
trying to overwrite '/lib/x86_64-linux-gnu/libgcc_s.so.1', which is also in package gcc-4.6 4.6.3-1ubuntu5
Errors were encountered while processing:
/var/cache/apt/archives/libgcc1_1%3a4.8.1-2ubuntu1~12.04_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
所以我删除了 gcc 4.6：
sudo apt-get remove gcc-4.6 …