The keyutils fix alone didn't resolve it — confirmed live with keyutils
already installed, the same error persisted. Root cause: the hardcoded
iocharset=utf8 mount option requires the kernel's nls_utf8 module, which
some kernels don't ship at all (confirmed live: `modprobe nls_utf8` on a
stock Ubuntu 6.8.0-137-generic VPS kernel returns "FATAL: Module
nls_utf8 not found" — not loadable, not built in). Every such mount
fails with errno 79 (ELIBACC) regardless of credentials, which is why
this recurred identically after the keyutils fix.
Both vpn-data-mount.sh and mount-network-drive.sh now probe with a
harmless `modprobe nls_utf8` before adding the option, and mount without
it (falling back to the kernel's build-time nls_default) with a clear
warning if the module isn't available, instead of hard-failing.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H4k6J1qXXyYxhGEgnJaMvn
Claude
9e886ff9a7