从6.06升级到8.04失败，如何恢复6.06?

[wwangzhihang]

升级的过程中提示xscale-font不能安装，现在gnome不能进去了，只能在命令行状态下。如何继续升级或者恢复原来的6.06呢？谢谢
就是这个错误信息
Unpacking xfonts-scalable (from .../xfonts-scalable_1%3a1.0.0-6_all.deb) ...
Setting up xfonts-scalable (1:1.0.0-6) ...
usage error: unrecognized option
Usage: update-fonts-dir DIRECTORY ...
update-fonts-dir { -h | --help }
This program is a wrapper for mkfontdir(1x) that is primarily useful to Debian
package maintainer scripts. See update-fonts-dir(8) for more information.
Options:
-h, --help display this usage message and exitdpkg: error processing xfonts-scalable (--configure):
subprocess post-installation script returned error exit status 2
Errors were encountered while processing:
xfonts-scalable
E: Sub-process /usr/bin/dpkg returned an error code (1)