当我跑进last终端时，我发现了这个：
roundduc pts/0 :0 Sun Nov 15 16:47 still logged in
roundduc :0 :0 Sun Nov 15 16:46 still logged in
reboot system boot 3.19.0-33-generi Sun Nov 15 16:46 - 16:48 (00:01)
roundduc pts/1 :0 Sun Nov 15 16:44 - 16:45 (00:00)
roundduc pts/8 :0 Sun Nov 15 16:37 - 16:37 (00:00)
roundduc pts/1 :0 Sun Nov 15 16:37 - 16:39 (00:02)
roundduc pts/1 :0 Sun Nov 15 16:37 - 16:37 (00:00)
roundduc pts/71 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/70 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/69 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/68 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/67 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/66 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/65 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/64 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/63 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/62 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/61 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/60 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/59 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/58 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/57 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/56 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/55 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/54 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/53 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/52 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/51 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/50 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/49 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/48 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/47 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/46 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/45 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/44 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/43 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/42 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/41 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/40 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/39 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/38 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/37 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/36 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/35 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/34 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/33 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/32 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/31 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/30 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/29 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/28 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/27 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/26 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/25 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/24 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/23 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/14 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/13 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/8 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc pts/1 :0 Sun Nov 15 16:36 - 16:37 (00:00)
roundduc :0 :0 Sun Nov 15 16:33 - down (00:11)
看看我的登录次数在一秒钟内发生了多少次。我记得更改了 GRUB 的主题，但我不认为这是真正的原因。我担心我被黑客入侵了，尤其是所有这些登录都发生在 11 月 15 日 16:36（下午 4:36）。
答案1
没关系，我发现这是因为我愚蠢地使用ctrl+ alt+打开终端T。我没有被黑客入侵。