Before clone this toolchains, you will need to install Git LFS on ur env

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Ubuntu 18.04

sudo apt install git-lfs

Ubuntu 16.04

sudo apt install software-properties-common
curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh | sudo bash 
sudo apt install git-lfs

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LINARO GCC

Date	Variant	Arch	Version	Repo Link	Clone	Status
16/03/2019	LINARO (GCC)	ARM64	5.5.0	LINARO 5.5.0 - 20190316	git clone https://github.com/najahiiii/aarch64-linux-gnu.git -b linaro5-20190316	Error
16/02/2019	LINARO (GCC)	ARM64	8.2.1	LINARO 8.2.1 - 20190216	git clone https://github.com/najahiiii/aarch64-linux-gnu.git -b linaro8-20190216	Fine
02/04/2019	LINARO (GCC)	ARM64	8.3.0	LINARO 8.3.0 - 20190402	git clone https://github.com/najahiiii/aarch64-linux-gnu.git -b linaro8-20190402	Fine

GNU GCC

Date	Variant	Arch	Version	Repo Link	Clone	Status
01/03/2019	GNU (GCC)	ARM64	4.9.4	GCC 4.9.4 - 20190301	git clone https://github.com/najahiiii/aarch64-linux-gnu.git -b gcc4.9.4-20190301	Error
14/03/2019	GNU (GCC)	ARM64	5.5.0	GCC 5.5.0 - 20190314	git clone https://github.com/najahiiii/aarch64-linux-gnu.git -b gcc5-20190314	Error
04/05/2019	GNU (GCC)	ARM64	9.1.0	GCC 9.1.0 - 20190504	git clone https://github.com/najahiiii/aarch64-linux-gnu.git -b gcc9-20190401	Fine
23/01/2015	GNU (GCC)	ARM64	4.9.x	GCC 4.9.x - Prerelease Mirror	git clone https://github.com/najahiiii/aarch64-linux-gnu.git -b 4.9-mirror	Fine
23/01/2015	GNU (GCC)	ARM	4.9.x	GCC 4.9.x - Prerelease Mirror	git clone https://github.com/najahiiii/aarch64-linux-gnu.git -b 4.9-32-mirror	Fine
03/03/2019	GNU (GCC)	ARM64	8.3.x	GCC 8.3.x - GNU Toolchain for the Cortex-A Family 2019.03	git clone https://github.com/najahiiii/aarch64-linux-gnu.git -b gcc8-201903-A	Fine

Alternative TC Repo

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https://github.com/najahiii/aarch64-linux-gnu.git