When I ran last into the terminal, I found this:
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)
Look how many logins of mine happened in the span of a SECOND. I remember changing GRUB's theme, but I don't think that's really the cause here. I'm worried I got hacked, especially with all those logins happening at Nov 15, 16:36 (4:36 PM).
