add ubuntu 20.04_arm64 woooow

linux_cross/install_apt_ubuntu_20.04_arm64.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+arch=$1
+toolchain=$2
+
+cp -vf /soft/ubuntu.sources.20.04.arm64.sh /etc/apt/sources.list.d/ubuntu.sources
+
+bash /soft/install_apt.sh $arch $toolchain

linux_cross/ubuntu.sources.20.04.arm64.sh

@@ -0,0 +1,33 @@
+## See the sources.list(5) manual page for further settings.
+Types: deb
+URIs: http://mirror.yandex.ru/ubuntu/
+Suites: focal focal-updates focal-backports
+Components: main universe restricted multiverse
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
+Architectures: amd64
+
+## Ubuntu security updates. Aside from URIs and Suites,
+## this should mirror your choices in the previous section.
+Types: deb
+URIs: http://mirror.yandex.ru/ubuntu/
+Suites: focal-security
+Components: main universe restricted multiverse
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
+Architectures: amd64
+
+## See the sources.list(5) manual page for further settings.
+Types: deb
+URIs: http://mirror.yandex.ru/ubuntu-ports/
+Suites: focal focal-updates focal-backports
+Components: main universe restricted multiverse
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
+Architectures: arm64
+
+## Ubuntu security updates. Aside from URIs and Suites,
+## this should mirror your choices in the previous section.
+Types: deb
+URIs: http://mirror.yandex.ru/ubuntu-ports/
+Suites: focal-security
+Components: main universe restricted multiverse
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
+Architectures: arm64