正确的盲文字体

正确的盲文字体

有 Ubuntu 16.04 操作系统。我从这里安装了盲文字体http://www.fontspace.com/philing/braille-normal

我想编译从这里

\documentclass{article}
\usepackage{braille}
\usepackage{fontspec}
\newfontfamily{\braille}{Braille Normal}

\begin{document}
{\obeylines\braille
⡂⡀⣀⢀⣄⡀⣰⡉⡀⠀⡀⡀⣀⠀⢀⣀⢀⣄⡀⡂⢀⣀⡀⢀⢀⡀⠀⡰⣀⠀⣀⠀⡂⡀⣀⢀⣄⡰⡀⢠⠂
⡇⡏⠀⡇⡇⠀⢸⠀⡇⢀⡇⡏⠀⡇⣏⠀⠀⡇⠀⡇⣏⠀⣹⢸⠁⢸⠀⡇⢈⠷⡁⠀⡇⡏⠀⡇⡇⠀⡇⢼⠀
⠁⠁⠀⠁⠈⠁⠈⠀⠈⠁⠁⠁⠀⠁⠈⠉⠀⠈⠁⠁⠈⠉⠁⠈⠀⠈⠀⠱⠉⠀⠉⠀⠁⠁⠀⠁⠈⠱⠁⠘⠄
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⢤⡀⡤⠀⣀⣀⣀⠀⢤⡀⡤⠀⠀⢰⠀⠀⢹⠠⠀
⠀⠀⠀⣠⠛⣄⠀⠒⠒⠒⠀⣠⠛⣄⠀⠉⢹⠉⠁⢸⢀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⠀
⠀⠀⠀⣄⢄⠤⢄⢴⠤⢠⠀⢠⢠⡠⢠⡠⢄⠀⢤⡀⡤⢺⡖⠐⣷⠂⠊⢉⡆
⠀⠀⠀⡇⠸⣍⣉⠸⣀⠸⣀⢼⢸⠀⢸⠀⢸⠀⣠⠛⣄⠀⠀⠀⠀⠀⣴⣋⡀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

⢱⠀
⢸⠁
} 

\end{document}

但我有一个错误,例如:

Missing character: There is no ⣠ in font Braille Normal/OT!
Missing character: There is no ⠛ in font Braille Normal/OT!
Missing character: There is no ⣄ in font Braille Normal/OT!
Missing character: There is no ⠀ in font Braille Normal/OT!
Missing character: There is no ⠉ in font Braille Normal/OT!
Missing character: There is no ⢹ in font Braille Normal/OT!

结果我得到一张空白页。

我应该安装什么盲文字体才能正确编译?

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