然后我导入之前显示错误：
/home/dex/anaconda3/lib/python3.6/site-packages/torch/utils/cpp_extension.py:118: UserWarning:
!! WARNING !!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Your compiler (c++) may be ABI-incompatible with PyTorch!
Please use a compiler that is ABI-compatible with GCC 4.9 and above.
See https://gcc.gnu.org/onlinedocs/libstdc++/manual/abi.html.
See https://gist.github.com/goldsborough/d466f43e8ffc948ff92de7486c5216d6
for instructions on how to install GCC 4.9 or higher.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!! WARNING !!
warnings.warn(ABI_INCOMPATIBILITY_WARNING.format(compiler))
但按照要点尝试安装 4.9 和 5.9 时出现同样的错误，无法安装，在 18.04 上也是如此，但出现其他错误：
dex@dexpc:~$ sudo apt-get install software-properties-common
[sudo] password for dex:
Reading package lists... Done
Building dependency tree
Reading state information... Done
software-properties-common is already the newest version (0.96.24.32.4).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
dex@dexpc:~$ sudo add-apt-repository ppa:ubuntu-toolchain-r/test
WARNING:root:could not open file '/etc/apt/sources.list'
WARNING:root:could not open file '/etc/apt/sources.list'
Toolchain test builds; see https://wiki.ubuntu.com/ToolChain
More info: https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test
Press [ENTER] to continue or Ctrl-c to cancel adding it.
WARNING:root:could not open file '/etc/apt/sources.list'
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://dl.google.com/linux/chrome/deb stable Release
Hit:3 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu bionic InRelease
0% [Release.gpg gpgv 1 189 B] [Connected to download.docker.com (52.222.250.2
Hit:5 http://ppa.launchpad.net/teejee2008/ppa/ubuntu bionic InRelease
Hit:6 https://download.docker.com/linux/ubuntu bionic InRelease
Hit:7 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu bionic InRelease
Reading package lists... Done
dex@dexpc:~$
dex@dexpc:~$ sudo apt-get update
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://dl.google.com/linux/chrome/deb stable Release
Hit:3 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu bionic InRelease
Hit:4 https://download.docker.com/linux/ubuntu bionic InRelease
Hit:6 http://ppa.launchpad.net/teejee2008/ppa/ubuntu bionic InRelease
Hit:7 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu bionic InRelease
Reading package lists... Done
dex@dexpc:~$ sudo apt-get install gcc-5.9 g++-5.9
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package gcc-5.9
E: Couldn't find any package by glob 'gcc-5.9'
E: Couldn't find any package by regex 'gcc-5.9'
E: Unable to locate package g++-5.9
E: Couldn't find any package by glob 'g++-5.9'
E: Couldn't find any package by regex 'g++-5.9'
dex@dexpc:~$ gcc --version gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
答案1
/usr/share/doc/apt/examples/sources.list 中应该有 sources.list 的副本。复制 /etc/apt/sources.list 以保存您输入的 ppa 更改，然后从新副本开始。然后运行
sudo apt-get update
sudo apt-get dist-upgrade
然后从保存的源列表副本中添加 ppa，并重复
sudo apt-get update
sudo apt-get dist-upgrade
为了以防万一，以下是新文件的内容：
# See sources.list(5) manpage for more information
# Remember that CD-ROMs, DVDs and such are managed through the apt-cdrom tool.
deb http://us.archive.ubuntu.com/ubuntu xenial main restricted
deb-src http://us.archive.ubuntu.com/ubuntu xenial main restricted
deb http://security.ubuntu.com/ubuntu xenial-security main restricted
deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
deb http://us.archive.ubuntu.com/ubuntu xenial-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu xenial-updates main restricted