Errno 79 is ELIBACC ("Can not access a needed shared library"), not
ENOKEY as previously assumed — mount.cifs prints glibc's literal
strerror() text for it. It recurred with valid, correctly-captured
credentials because the real cause was never authentication: cifs-utils
hard-depends on the libkeyutils1 library but only Recommends the
keyutils package itself, which ships /sbin/request-key and the
/etc/request-key.d/*.conf handlers the kernel's upcall path invokes.
Minimal cloud VPS images commonly disable install-recommends, so
`apt-get install cifs-utils` alone silently skips it and every mount —
guest or fully credentialed — fails identically.
Install keyutils explicitly wherever cifs-utils is installed:
services/base.sh's unconditional package list, vpn-data-mount.sh's
lazy install-on-mount path, and tools/mount-network-drive.sh's SMB
branch.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H4k6J1qXXyYxhGEgnJaMvn
Claude
2d9501a56c