求助，rk3399pro的板子搭建linux交叉编译

lizhaoping11

sudo apt-get install repo git-core gitk git-gui gcc-arm-linux-gnueabihf u-boot-tools device-tree-compiler \
gcc-aarch64-linux-gnu mtools parted libudev-dev libusb-1.0-0-dev python-linaro-image-tools \
linaro-image-tools autoconf autotools-dev libsigsegv2 m4 intltool libdrm-dev curl sed make \
binutils build-essential gcc g++ bash patch gzip bzip2 perl tar cpio python unzip rsync file bc wget \
libncurses5 libqt4-dev libglib2.0-dev libgtk2.0-dev libglade2-dev cvs git mercurial rsync openssh-client \
subversion asciidoc w3m dblatex graphviz python-matplotlib libc6:i386 libssl-dev texinfo \
liblz4-tool genext2fs lib32stdc++6

上面是是维基上面的教程，实际执行之后出现下面错误
E: Package 'gcc-aarch64-linux-gnu' has no installation candidate
E: Unable to locate package libc6:i386
E: Unable to locate package lib32stdc++6
E: Couldn't find any package by regex 'lib32stdc++6'

也就是说上面的四个文件安装命令不对或者名字不对，求教各位大佬如何解决这个问题