composer update时报错：has a broken sugnature

Question

项目使用composer进行包管理，但是进行包升级时报以下错误，该怎么解决？
ubuntu@ubuntu-VGN-SR13-B:~/nginx/coolwifi$composerselfupdate
PHPFatalerror:Uncaughtexception'PharException'withmessage'phar"/usr/local/bin/composer"hasabrokensignature'in/usr/local/bin/composer:13
Stacktrace:
#0/usr/local/bin/composer(13):Phar::mapPhar('composer.phar')
#1{main}
thrownin/usr/local/bin/composeronline13
解决：删掉/usr/local/bin/composer后，重新下载composer.phar复制进去添加执行权限后正常

Answer 1

看似权限不够，请试试：>sudocomposerself-updateor>sudosu>composerself-update

Answer 2

似乎需要重新安装，请查看issueongithub.