问题：今天找到了些新的软件软，打算更新下源来着的（毕竟之前添加的软太少了，很多软件都找不到）。但是在更新软件源（sudo apt-get update）的时候总是爆出如下错误，出现一连串的警告提示：
Unknown Multi-Arch type 'no' for package 'compiz-core'
Unknown Multi-Arch type 'no' for package 'compiz-gnome'
Unknown Multi-Arch type 'no' for package 'libxapian-dev'
Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-max
Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-min
Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-max
Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-min
Unknown Multi-Arch type 'no' for package 'kwin'
Unknown Multi-Arch type 'no' for package 'kwin-dev'
Unknown Multi-Arch type 'no' for package 'kwin-wayland'
Unknown Multi-Arch type 'no' for package 'kwin-x11'
Unknown Multi-Arch type 'no' for package 'libkf5sysguard-dev'
Ignoring Provides line with DepCompareOp for package php-psr-http-message-implementation
Ignoring Provides line with DepCompareOp for package php-psr-log-implementation
Ignoring Provides line with DepCompareOp for package php-seclib
Ignoring Provides line with DepCompareOp for package php-sabre-http
Ignoring Provides line with DepCompareOp for package php-math-biginteger
Ignoring Provides line with DepCompareOp for package pypy-cffi
Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-max
Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-min
You may want to run apt-get update to correct these problems
Reading package lists... Done
W: Unknown Multi-Arch type 'no' for package 'compiz-core'
W: Unknown Multi-Arch type 'no' for package 'compiz-gnome'
W: Unknown Multi-Arch type 'no' for package 'libxapian-dev'
W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-min
W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-min
W: Unknown Multi-Arch type 'no' for package 'kwin'
W: Unknown Multi-Arch type 'no' for package 'kwin-dev'
W: Unknown Multi-Arch type 'no' for package 'kwin-wayland'
W: Unknown Multi-Arch type 'no' for package 'kwin-x11'
W: Unknown Multi-Arch type 'no' for package 'libkf5sysguard-dev'
W: Ignoring Provides line with DepCompareOp for package php-psr-http-message-implementation
W: Ignoring Provides line with DepCompareOp for package php-psr-log-implementation
W: Ignoring Provides line with DepCompareOp for package php-seclib
W: Ignoring Provides line with DepCompareOp for package php-sabre-http
W: Ignoring Provides line with DepCompareOp for package php-math-biginteger
W: Ignoring Provides line with DepCompareOp for package pypy-cffi
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-min
W: You may want to run apt-get update to correct these problems
一开始一直以为是软件源配置出现问题，改了好多次结果还是一样，最后还是百度发现也有人遇到这问题了，大部分都说是apt版本过低了，更新下即可。
抱着尝试的心态也去试了下，在终端执行如下命令（-f是修复依赖关系的命令）：
apt-get install -f apt #普通用户前面加sudo执行之后会出现提示，有哪些包会被移出，新增哪些包，更新哪些包（按Y继续执行即可）：
The following packages will be REMOVED:
libapache2-mod-php5 perl-modules
The following NEW packages will be installed:
console-setup-linux gcc-5-base initramfs-tools-core libapt-inst2.0 libapt-pkg5.0 libfdisk1 libgcrypt20 liblz4-1
libmysqlclient20 libperl5.22 libsmartcols1 libsystemd0 linux-base perl-modules-5.22 rename
The following packages will be upgraded:
apt apt-utils bash-completion console-setup dbus dpkg init-system-helpers initramfs-tools initramfs-tools-bin
initscripts keyboard-configuration klibc-utils libalgorithm-diff-xs-perl libapparmor-perl libapt-pkg-perl libblkid1
libcgmanager0 libdbd-mysql-perl libdbi-perl libdbus-1-3 libfile-fcntllock-perl libgpg-error0 libklibc
liblocale-gettext-perl libmount1 libncurses5 libncursesw5 libselinux1 libstdc++6 libsub-name-perl
libterm-readkey-perl libtext-charwidth-perl libtext-iconv-perl libtext-soundex-perl libtinfo5 lsb-base perl
perl-base sysvinit-utils upstart ureadahead util-linux
42 upgraded, 15 newly installed, 2 to remove and 271 not upgraded.
安装过程中会弹出对话框，我直接enter了：
You will need a way to toggle the keyboard between the national layout and the standard Latin layout. │
│ │
│ Right Alt or Caps Lock keys are often chosen for ergonomic reasons (in the latter case, use the combination │
│ Shift+Caps Lock for normal Caps toggle). Alt+Shift is also a popular combination; it will however lose its │
│ usual behavior in Emacs and other programs that use it for specific needs. │
│ │
│ Not all listed keys are present on all keyboards. │
│ │
│ Method for toggling between national and Latin mode: 翻译：
您将需要一种方法来切换键盘之间的国家布局和标准拉丁布局。
对于人体工程学的原因，通常选择合适的ALT或CAP锁定键（在后一种情况下，使用组合）。
对于正常上限切换，移位+ CAP锁定。ALT+shift也是一个流行的组合，但是它将失去它的空间。
在Emacs和其他使用特定需求的程序中的常见行为。
并非所有列出的键都存在于所有键盘上。
在国家和拉丁模式之间切换的方法：
再来执行apt-get update的确不会再出现警告了，这次主要问题是apt与当前版本的ubuntun系统不匹配，ubuntun版本高于apt的版本．所以升级一下apt 就行了。