我使用 Live CD 在我的 HP Netbook（Mini Atom 1GHz CPU）上安装了 Ubuntu 10.10。我启动了它，然后将其升级到 11.04 Natty Narwhal。从下面我推测它被黑客入侵了，那么我该如何安全地启动我的笔记本电脑呢？
fsck util-linux-ng 2.17.2
fsck from util-linux-ng 2,17.2
/dev/sda5/: clean, 161364/7331840 files, 1234296/29314560 blocks
found 280698880 bytes used err is 0
total csum bytes : 269584
total tree byte:4644864
total fs tree bytes:3477504
btree space waste bytes:877726
file data ocks allocacated:2134724608
referenced:244753536
btrfs v0.19
Init :unreadaheda-other main process terminated with status 4
*starting network manager
skipping profile in /etc/apparmor/.d/disable: usr:.bin.firefox