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abhi1997
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Taking a longtime to boot ubuntu 18.04LTS on my laptop(i7 7500U@2.70GHz 16RAM)

HP Recommended
HP Probook 450 G4
Linux

abhi@abhi-HP-ProBook-450-G4:/etc/initramfs-tools/conf.d$ journalctl(only i have shown errors) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Exception: Could not find/re Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Exception: Could not find/re Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Exception: Could not find/re Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Exception: Could not find/re Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Error: Field [CAP1] at bit o Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Error: Method parse/executio Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Exception: Could not find/resolve named package element: PXPR (20170831/dspkginit-381) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Exception: Could not find/resolve named package element: PXPR (20170831/dspkginit-381) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Error: Field [CAP1] at bit offset/length 64/32 exceeds size of target Buffer (64 bits) (20170831/dsopcode-235) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Error: Method parse/execution failed \_SB._OSC, AE_AML_BUFFER_LIMIT (20170831/psparse-550) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: PKCS#7 signature not signed with a trusted key Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: PKCS#7 signature not signed with a trusted key Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Exception: Could not find/resolve named package element: PXPR (20170831/dspkginit-381) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Exception: Could not find/resolve named package element: PXPR (20170831/dspkginit-381) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Error: Field [CAP1] at bit offset/length 64/32 exceeds size of target Buffer (64 bits) (20170831/dsopcode-235) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Error: Method parse/execution failed \_SB._OSC, AE_AML_BUFFER_LIMIT (20170831/psparse-550) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: PKCS#7 signature not signed with a trusted key Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: PKCS#7 signature not signed with a trusted key Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Exception: Could not find/resolve named package element: PXPR (20170831/dspkginit-381) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Exception: Could not find/resolve named package element: PXPR (20170831/dspkginit-381) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: PKCS#7 signature not signed with a trusted key Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: PKCS#7 signature not signed with a trusted key Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Exception: Could not find/resolve named package element: PXPR (20170831/dspkginit-381) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Exception: Could not find/resolve named package element: PXPR (20170831/dspkginit-381) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Error: Field [CAP1] at bit offset/length 64/32 exceeds size of target Buffer (64 bits) (20170831/dsopcode-235) Sep 07 22:16:50 abhi-HP-ProBook-450-G4 kernel: ACPI Error: Method parse/execution failed \_SB._OSC, AE_AML_BUFFER_LIMIT (20170831/psparse-550) abhi@abhi-HP-ProBook-450-G4:~$ systemd-analyze critical-chain The time after the unit is active or started is printed after the "@" character. The time the unit takes to start is printed after the "+" character. graphical.target @37.374s └─multi-user.target @37.373s └─kerneloops.service @37.157s +215ms └─network-online.target @37.123s └─NetworkManager-wait-online.service @29.891s +7.230s └─NetworkManager.service @25.504s +4.381s └─dbus.service @24.061s └─basic.target @23.516s └─sockets.target @23.516s └─snapd.socket @23.494s +22ms └─sysinit.target @23.435s └─apparmor.service @22.466s +950ms └─local-fs.target @22.465s └─run-user-121.mount @32.096s └─local-fs-pre.target @6.033s └─keyboard-setup.service @2.582s +3.451s └─systemd-journald.socket @2.521s └─system.slice @2.521s └─-.slice @2.519s abhi@abhi-HP-ProBook-450-G4:/etc/initramfs-tools/conf.d$ systemd-analyze blame 19.418s dev-sda2.device 17.469s systemd-journal-flush.service 9.184s systemd-sysctl.service 8.609s systemd-udevd.service 7.666s plymouth-start.service 7.230s NetworkManager-wait-online.service 6.685s snapd.service 6.310s plymouth-quit-wait.service 6.236s ModemManager.service 6.006s udisks2.service 5.235s accounts-daemon.service 4.381s NetworkManager.service 4.377s dev-loop2.device 3.944s dev-loop5.device 3.714s networkd-dispatcher.service 3.451s keyboard-setup.service 3.254s networking.service 3.253s wpa_supplicant.service 3.097s dev-loop0.device 3.087s polkit.service 3.068s dev-loop6.device 3.033s grub-common.service 2.961s gpu-manager.service 2.949s dev-loop4.device 2.873s dev-loop1.device 2.736s dev-loop3.device 2.509s speech-dispatcher.service 2.423s avahi-daemon.service 2.387s thermald.service 2.090s alsa-restore.service 2.084s rsyslog.service 1.843s iio-sensor-proxy.service 1.835s pppd-dns.service 1.651s bluetooth.service 1.591s fwupd.service 1.579s apport.service 1.501s systemd-logind.service 1.198s systemd-tmpfiles-setup-dev.service 1.163s systemd-modules-load.service 1.139s systemd-backlight@backlight:intel_backlight.service 1.103s gdm.service 950ms apparmor.service 857ms systemd-remount-fs.service 792ms dev-mqueue.mount 791ms sys-kernel-debug.mount 787ms dev-hugepages.mount 708ms systemd-rfkill.service 649ms swapfile.swap 597ms packagekit.service 518ms snap-gtk\x2dcommon\x2dthemes-319.mount 464ms systemd-journald.service 413ms kmod-static-nodes.service 390ms ufw.service 383ms colord.service 379ms systemd-timesyncd.service 361ms snap-gnome\x2dsystem\x2dmonitor-51.mount 343ms snap-gnome\x2dcalculator-180.mount 340ms systemd-resolved.service 309ms snap-gnome\x2d3\x2d26\x2d1604-70.mount 280ms bolt.service 277ms snap-gnome\x2dcharacters-103.mount 261ms snap-gnome\x2dlogs-37.mount 258ms systemd-fsck@dev-disk-by\x2duuid-6761\x2d9723.service 250ms snap-core-4917.mount 226ms upower.service 215ms kerneloops.service 210ms console-setup.service 174ms systemd-user-sessions.service 174ms systemd-random-seed.service 161ms systemd-tmpfiles-setup.service 156ms systemd-update-utmp.service 131ms setvtrgb.service 122ms systemd-tmpfiles-clean.service 105ms snapd.seeded.service 86ms dns-clean.service 67ms boot-efi.mounts 62ms plymouth-read-write.service 53ms systemd-udev-trigger.service 39ms rtkit-daemon.service 34ms user@1000.service 26ms user@121.service 22ms snapd.socket 13ms systemd-update-utmp-runlevel.service 6ms ureadahead-stop.service 5ms nvidia-persistenced.service 2ms sys-kernel-config.mount 2ms sys-fs-fuse-connections.mount abhi@abhi-HP-ProBook-450-G4:~$ systemd-analyze time Startup finished in 5.022s (firmware) + 11.520s (loader) + 6.884s (kernel) + 37.390s (userspace) = 1min 817ms graphical.target reached after 37.374s in userspace

 

 

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WAWood
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@abhi1997

 

HP only warranties their PCs for usage with the OS that comes preinstalled.  IF you replace that or add a different OS, then you assume full responsibility for maintaining that other OS -- as HP then provides  assistance only on Redhat and then only to commercial customers.
 
Your best bet for Linux support, since HP does not provide Linux drivers, is to contact the support forum for the Linux distro you are trying to install   -- in this case, the Ubuntu Forums:  http://ubuntuforums.org/

Folks there have experience using HP machines with Linux and know a lot about driver sources and installation issues.
 
Good Luck

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