我使用的是 Google Chrome 48.0 32 位。今天当我启动谷歌浏览器时，我收到了这条消息：
This computer will soon stop receiving Google Chrome updates because
this Linux system will no longer be supported
我认为 Ubuntu 14.04 支持五年，这里到底发生了什么？
在 64 位 Ubuntu 上，我从更新管理器收到错误消息apt-get update：
Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release
Unable to find expected entry 'main/binary-i386/Packages' in Release file
(Wrong sources.list entry or malformed file)
Some index files failed to download.
They have been ignored, or old ones used instead.
执行apt-get-update 后，我总是收到以下错误消息：
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/ubuntu-audio-dev/ppa/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'http://dl.google.com/linux/chrome/deb stable InRelease' doesn't support architecture 'i386'
E: Failed to fetch http://ppa.launchpad.net/ubuntu-audio-dev/ppa/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have …当我尝试使用
sudo apt-get update
它给出了这个错误：
Fetched 5.530 kB in 53s (104 kB/s)
W: GPG error: http://extras.ubuntu.com precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192
W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release Unable to find expected entry 'main/binary-i386/Packages' in Release file (Wrong sources.list entry or malformed file)
E: Some index files failed to download. They have been ignored, or old ones used instead.
当我尝试访问 etc/apt 文件夹时，它说没有这样的文件或目录。
我怎样才能解决这个问题？