I have ran windows 7, 10, ubuntu 16.04, linux mint and maybe others and i can't recall it doing this before. it is hp 450 g2 laptop. it is not a 2in1 tablet/laptop. i looked for info in forums but had no luck. i also checked in settings because i thought it may have had a tablet setting i could turn off.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 27 21:58:43 2018
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation HD Graphics 5500 [8086:1616] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company HD Graphics 5500 [103c:2248]
Subsystem: Hewlett-Packard Company Topaz PRO [Radeon R5 M255] [103c:224a]
InstallationDate: Installed on 2018-04-27 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
MachineType: Hewlett-Packard HP ProBook 450 G2
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic root=UUID=d0b638ce-09f3-4d54-a78f-b7aeebaef22f ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/21/2015
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: M73 Ver. 01.09
dmi.board.name: 2248
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 59.21
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvrM73Ver.01.09:bd01/21/2015:svnHewlett-Packard:pnHPProBook450G2:pvrA3009DD10303:rvnHewlett-Packard:rn2248:rvrKBCVersion59.21:cvnHewlett-Packard:ct10:cvr:
dmi.product.family: 103C_5336AN G=N L=BUS B=HP S=PRO
dmi.product.name: HP ProBook 450 G2
dmi.product.version: A3009DD10303
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
There is a rotation lock button you can choose next to the power button in the Gnome system menu. Please try that.