由于目前没有找到一个合适的办法，将本机.NET Core的版本升级到1.1，故只有先卸载再安装最新版本了。

卸载脚本链接为：https://github.com/dotnet/cli/blob/rel/1.0.0/scripts/obtain/uninstall/dotnet-uninstall-pkgs.sh

#!/usr/bin/env bash
#
# Copyright (c) .NET Foundation and contributors. All rights reserved.
# Licensed under the MIT license. See LICENSE file in the project root for full license information.
#

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

current_userid=$(id -u)
if [ $current_userid -ne 0 ]; then
    echo "$(basename "$0") uninstallation script requires superuser privileges to run" >&2
    exit 1
fi

# this is the common suffix for all the dotnet pkgs
dotnet_pkg_name_suffix="com.microsoft.dotnet"
dotnet_install_root="/usr/local/share/dotnet"
dotnet_path_file="/etc/paths.d/dotnet"

remove_dotnet_pkgs(){
    installed_pkgs=($(pkgutil --pkgs | grep $dotnet_pkg_name_suffix))
    
    for i in "${installed_pkgs[@]}"
    do
        echo "Removing dotnet component - \"$i\"" >&2
        pkgutil --force --forget "$i"
    done
}

remove_dotnet_pkgs
[ "$?" -ne 0 ] && echo "Failed to remove dotnet packages." >&2 && exit 1

echo "Deleting install root - $dotnet_install_root" >&2
rm -rf "$dotnet_install_root"
rm -f "$dotnet_path_file"

echo "dotnet packages removal succeeded." >&2
exit 0

执行的时候，需要chmod 777