Try reinstalling from Internet Recovery mode instead:
Command + Option + R on boot
MacOS 10.13.6 Update Failed to Complete? Mac Won’t Boot? Troubleshooting Update Failures
by ray | Jul 31, 2018 | Mac OS X | 0 comments
Categories
- Android
- Atlassian
- AWS
- Azure
- Blackberry
- Bootable USB flash drives
- Boto
- Browsers
- CDN
- Chromebooks
- CleanBrowsing
- Cloud Storage
- Cloudflare
- Confluence
- DigitalOcean
- DNS
- dokuwiki
- Dropbox
- Dyn
- eero
- EPiServer
- Exchange Mail Server
- FFmpeg
- FTP
- G Suite
- Ghost
- Git
- GitHub
- GitLab
- Godaddy
- Graphics / Photos
- Hardware
- Headless CMS
- HTML / Web
- iOS
- IT / Tech News
- JIRA
- LibreOffice
- Linux / Ubuntu
- Mac OS X
- Mailchimp
- Microsoft
- Microsoft SQL
- Microsoft Windows
- Mint Mobile
- NGINX
- Node.js
- phpMyAdmin
- Podcasts
- Python
- Raspberry Pi
- rclone
- Security
- SEO
- Spiceworks
- SQL Server
- SSL certificates
- Tools
- TP-Link
- Training/Coding
- Uncategorized
- Untangle
- VPN
- Wordpress
- WP Engine
- Xbox
- Zendesk