在ubuntu下install文件之前要执行一下upgrate，出错解决办法

W: GPG error: http://ppa.launchpad.net trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5643F5AEBF4CAA63

pan:~$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5643F5AEBF4CAA63

Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.ZMWgweDnVa --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d/hzwhuang-ss-qt5.gpg
--keyring /etc/apt/trusted.gpg.d/levi-armstrong-ppa.gpg --keyring /etc/apt/trusted.gpg.d/levi-armstrong-qt-libraries-trusty.gpg --keyring /etc/apt/trusted.gpg.d/sogou-archive-keyring.gpg --keyring /etc/apt/trusted.gpg.d/ubuntu-wine-ppa.gpg --keyring /etc/apt/trusted.gpg.d/v-launchpad-jochen-sprickerhof-de-pcl.gpg
--keyserver keyserver.ubuntu.com --recv-keys 5643F5AEBF4CAA63

gpg: requesting key BF4CAA63 from hkp server keyserver.ubuntu.com

gpg: key BF4CAA63: public key "Launchpad pscroll" imported

gpg: Total number processed: 1

gpg:               imported: 1  (RSA: 1)