testing braille display

[Lubos Pintes]

Hello all,
I tested setup of my display compatible with ALVA with negative result. It 
works from console by runing this command:
sudo brltty -b al -d /dev/ttyUSB0
I tested the brltty-setup (F5, 4, enter, enter)with lines:
u
0
al

Display was not started.

Several lines from /var/log/syslog:
Feb 13 20:30:02 ubuntu kernel: [ 60.877137] Kernel command line: 
BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper 
initrd=/casper/initrd.gz quiet splash -- hpet=disable brltty=ask

Feb 13 20:30:03 ubuntu brltty[6462]: /lib/brltty/libbrlttybask.so: cannot 
open shared object file: No such file or directory

Feb 13 20:30:03 ubuntu brltty[6462]: Cannot load braille driver: 
/lib/brltty/libbrlttybask.so



I suppose that the parameter "brltty=ask" is for running the brltty-setup. 
But the libbrlttybask.so probably not exists. Stupid bug? Or, more probably 
I do not understand something trivial. :-)