1.安装
sudo pacman -S powerpill

2.系统升级pacman -Syu换成
powerpill -Syu

3.安装软件
powerpill -S packagename1 packagename2

=========================
已知报错:
In case you get an [err] for .db.sig files:

b5d7d7|ERR | 0B/s|/var/lib/pacman/sync/extra.db.sig
899e91|ERR | 0B/s|/var/lib/pacman/sync/multilib.db.sig
8fcc32|ERR | 0B/s|/var/lib/pacman/sync/core.db.sig
85eb3d|ERR | 0B/s|/var/lib/pacman/sync/community.db.sig

解决办法:
sudo vi /etc/pacman.conf
注释掉此行
#SigLevel = Optional TrustedOnly
新添加此行
SigLevel = PackageRequired