系统升级:
[root@netgate ~]# apt-get upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
The following packages will be upgraded
apt convmv freetype freetype-devel mtr nmap python-elementtree
python-urlgrabber rsync syslinux xrestop yum
The following packages have been kept back
lftp
12 upgraded, 0 newly installed, 0 removed and 1 not upgraded.
Need to get 4685kB of archives.
After unpacking 2767kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
...