OT no-repro, OP gave up and reinstalled Ubuntu.

[ Natty | Sentinel ] boot After installing Ubuntu, my PC still boots to Windows By: kdv666 3.5;

[ Natty | Sentinel ] networking Ubuntu 18.04.2 Ethernet Bonding By: EmbALL 3.5;

[ Natty | Sentinel ] wireless Realtek WiFi Adapter Not Found after 19.10 upgrade By: raok 3.5;

[ Natty | Sentinel ] boot _usr_bin_gnome-shell.120.crash every boot By: kbs170 5.5;

[ Natty | Sentinel ] .desktop it start but No DESKTOP By: Fabio Ranieri 4.5;

[ Natty | Sentinel ] 19.10 X-AIR Edit App not working - UbuntuStudio 19.10 By: Frank Smith 4.0;

[ Natty | Sentinel ] uninstall How to remove a dock from Plank? By: w3b_bl4de 3.5;

[ Natty | Sentinel ] boot Ubuntu 18.04 LTS on Virtualbox boots up, but black login screen By: Wolfgang Schulz 3.5;

[ Natty | Sentinel ] mount Error mounting /dev/sdb1 at /media/ on Ubuntu 14.04 LTS By: Janith Sandaruwan 4.5;

[ SmokeDetector | MS ] Bad keyword in body, bad keyword in title, blacklisted website in body, pattern-matching product name in body, pattern-matching product name in title, +2 more (493): Hemp Max Lab CBD Oil Reviews Canada? by hempca54 on askubuntu.com

[ Natty | Sentinel ] installation installation error media is either dirty or damaged By: Berg Wolk 5.5;

[ Natty | Sentinel ] 18.04 Wacom Intuos CTL4100 on Ubuntu 18.04: device settings not available By: SPP 4.5;

OT no-repro, OP gave up and reinstalled Ubuntu.

@Natty report askubuntu.com/a/1223415

[ Natty | Sentinel ] Link to Post Low Length; No Code Block; Low Rep; 2.5;

[ Natty | Sentinel ] networking how to use regular expression with iptables By: ubercracker 4.5;

[ Natty | Sentinel ] usb Front USB Ports Not Detected By: zerdecal 4.0;

[ Natty | Sentinel ] networking Raspberry Pi 4B - Ubutnu 19.10 - Wired Network Unmanaged By: Bernd Kiefer 4.5;

[ SmokeDetector | MS ] Bad keyword in link text in answer, potentially bad keyword in answer (82): Gnome 3.16 HiDPI scaling only accepts integers by logmyerq on askubuntu.com

[ Natty | Sentinel ] usb Front USB Ports Not Detected By: Casper042 3.5;

seems deletable. Answer also seems VLQ.

[ Natty | Sentinel ] 16.04 Shutdown stuck on the reboot: Power down step By: RjveraL 5.0;

[ Natty | Sentinel ] nvidia My screen resolution changed overnight and I can't seem to change it By: Art 4.0;

[ Natty | Sentinel ] 18.04 Ubuntu 18.04 don't recognize Droidcam as a sound input device By: Beernarrd 4.5;