Ubi9 comes with subversion 1.14 and since subversion 1.12 plaintext password is disabled.
Subversion 1.12 changes:
On Unix-like systems, client-side storage of passwords in plaintext on disk is now disabled by default at compile-time. Password caching mechanisms based on Gnome Keyring, Kwallet, or GPG-Agent, are recommended instead.
The following authentication credential caches are available starting subversion 1.12:
- Gnome Keyring
- GPG-Agent
- KWallet (KDE)