最近装了ubuntu18.04 LTS，下载软件有点慢，网上搜了下解决方案，大致是两种：一、把/etc/apt/sources.list文件里的源更换一下，改成阿里云或者其它的镜像的文件；二、更换software&updates里的select best server。

一、更换/etc/apt/sources.list文件里的源

1. 备份源列表

Ubuntu配置的默认源并不是国内的服务器，下载更新软件都比较慢。首先备份源列表文件sources.list：

# 首先备份源列表
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup

2. 打开sources.list文件修改

选择合适的源，替换原文件的内容，保存编辑好的文件, 以阿里云更新服务器为例（可以分别测试阿里云、清华、中科大、163源的速度，选择最快的）：

# 打开sources.list文件
sudo gedit /etc/apt/sources.list

编辑/etc/apt/sources.list文件, 在文件最前面添加阿里云镜像源：

#  阿里源
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

3. 刷新列表

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install build-essential

下载速度瞬间就起飞了。

4. 其他源

中科大源：

#  中科大源
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse

163源：

# 163源
deb http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse

清华源：

# 清华源
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse

转载自：https://zhuanlan.zhihu.com/p/61228593

windows10 Linux子系统（Ubuntu 18.04）编译EOS报错如下

surou@DESKTOP-444S803:/mnt/c/github/eos$ ./scripts/eosio_build.sh
EOSIO Version: 1.8.6
Sat Jan  4 05:50:58 UTC 2020
User: surou
Current branch: develop
./scripts/eosio_build.sh: line 129: set: -i: invalid option
set: usage: set [-abefhkmnptuvxBCHP] [-o option-name] [--] [arg ...]

原因是子系统的系统名不是Ubuntu

( [[ ! $NAME == "Ubuntu" ]] && [[ ! $ARCH == "Darwin" ]] ) && set -i # Ubuntu doesn't support interactive mode since it uses dash + Some folks are having this issue on Darwin; colors aren't supported yet anyway

查看子系统的Name

surou@DESKTOP-444S803:/mnt/c/github/eos$ echo $NAME
DESKTOP-444S803

所以编译时设置下环境变量即可
编辑环境变量配置文件

vim ~/.bashrc

将下面参数添加到文件尾部

export NAME=Ubuntu
export VERSION_ID=18.04

备注：如果安装1.8.x的EOS，且没配置过环境变量的话，可以一起加上

export PATH=$PATH:/home/surou（当前用户名）/eosio/1.8/bin

然后刷新环境变量

source ~/.bashrc

然后再次执行

surou@DESKTOP-444S803:/mnt/c/github/eos$ ./scripts/eosio_build.sh

From eosio.cdt v1.6 onwards
You have to #include <eosio/system.hpp> and then you can use:

eosio::current_time_point
eosio::current_block_time
to cast from time_point to uint32_t u can use like:
eosio::current_time_point().sec_since_epoch();

参考

https://github.com/EOSIO/eosio.cdt/issues/470

首先用 git config --list 查看一下

user.name=surou
user.email=652511569@qq.com

如果不对，用命令设置一下

git config --global user.name "xxxx"
git config --global user.email  "xxxx"

如果还不行，执行一下命令，重新输入用户名密码就可以了：

git config --system --unset credential.helper

如果是Windows平台提示权限不足，就去git 安装目录右键管理员权限运行git-bash.exe，然后再切换到仓库目录再次执行。

https://www.eospow.org/
https://github.com/NedAmarril/eosiopowcoin

EOS 工作量证明硬币（POW）[1]将PoW（工作量证明）采矿时间表和调整比特币（BTC）[2] 的难度应用于EOSIO [3]令牌。

每10分钟铸造50个战俘，持续约4年，然后将一半铸造成一半。一直重复，直到有2100万个POW，与BTC完全一样。

EOS CPU和NET资源用于通过将EOS转移到eosiopowcoin来挖掘POW。每次您将EOS发送到eosiopowcoin合约账户时，该EOS的确切金额加上eosiopowcoin账户中总POW供应量的0.0025％将会被转回给您。

POW是一个完全分散的，不信任的开源项目，无需开发人员分配。每个单独的战俘都已经或将要被开采。没有给予战俘免费或预先开采。使用setupminer 操作后，任何人都可以挖掘POW 。战俘的铸造将持续到供应达到2100万为止。没有人可以阻止POW的铸造，开采或分销。合同是无钥匙的。