Page at https://wiki.edubuntu.org/UbuntuOne/Bugs mentions how this will also be indicated with -1 values in syncdaemon.conf, yet I've had it with on = True and read_limit and write_limit set to 0. The same fix of removing the file helped me :)
-- "Protocol version error" - when bandwidth throttling is enabled with the default values https://bugs.launchpad.net/bugs/455544 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs