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Questions tagged [boot]

Use this tag if you have trouble booting Ubuntu or you have questions about the bootup process.

Boot is a process of starting a computer system. Consider using the boot info script when asking your question:

24857 questions
658
votes
26 answers

How do I free up more space in /boot?

My /boot partition is nearly full and I get a warning every time I reboot my system. I already deleted old kernel packages (linux-headers...), actually I did that to install a newer kernel version that came with the automatic updates. After…
user6722
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537
votes
32 answers

My computer boots to a black screen, what options do I have to fix it?

I am trying to boot Ubuntu on my computer. When I boot Ubuntu, it boots to a black screen. How can I fix this? Table of Contents: If you are trying to install Ubuntu If you have a dual boot system If an update or something else caused your…
Jorge Castro
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471
votes
8 answers

How do I change the GRUB boot order?

I have both Windows 7 and Ubuntu installed on a shared machine. Because a lot of the non-developers use Windows, I'd like to change the boot order to make it easier for them. Currently the boot order looks like the following: Ubuntu 11.10…
chrisl-921fb74d
  • 11,136
466
votes
10 answers

How to get to the GRUB menu at boot-time?

My system is not dual-boot, I run a standard Ubuntu desktop system "on the metal" (I think running it in a VM is the same). Pressing c while booting does not cause the GRUB menu to appear (which I believe it does for a dual-boot system). How can I…
Peter.O
  • 25,251
401
votes
7 answers

fsck error on boot: /dev/sda6: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY

I dual boot Ubuntu and Windows 7. I was browsing on FireFox in Ubuntu and all of a sudden I get some error message, so I rebooted. Now when I try to boot into Ubuntu I get this message: fsck from util-linux 2.26.2 /dev/sda6 contains a file system…
Jordy
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372
votes
7 answers

Boot drops to a (initramfs) prompts/busybox

I am running an HP pavilion dv6000 dual boot win7 and Ubuntu 12.04. (well, up until today). After a reboot, the boot process drops to the BusyBox shell and I end up at the prompt: BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell…
dpm
  • 3,721
280
votes
12 answers

Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Upon trying to upgrade from 10.10 to 11.04 all seemed to go well until the restart. This error message is what comes up: Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) How do we fix that?
Jeffrywith1e
  • 3,055
279
votes
11 answers

How do I set the grub timeout and the grub default boot entry?

In Ubuntu 12.04 (or above), how do I set the GRUB time and the default OS (that I see at boot time) as I'm dual-booting Windows (7/8) and Ubuntu (12.04 or above)?
meteors
  • 3,045
262
votes
13 answers

Uninstall GRUB and use Windows bootloader

I have Windows 8 pre-installed, and then I installed GRUB with Ubuntu. Ubuntu is not my thing, so now I want to remove it along with GRUB. From what I have learned, with UEFI, GRUB does not overwrite the windows bootloader in the EFI partition and…
mrolive
  • 2,775
258
votes
16 answers

How do I disable X at boot time so that the system boots in text mode?

Is it possible to disable X at boot time? I'm setting up a server so it would be nice if it wouldn't load the graphical interface every time I boot.
Olivier Lalonde
  • 60,581
251
votes
3 answers

System has not been booted with systemd as init system (PID 1). Can't operate

I use WSL2 on Windows 11. I want to run the systemctl command in Ubuntu 20.04, but it gives me the following error: System has not been booted with systemd as init system (PID 1). Can't operate. Failed to connect to bus: Host is down How can I fix…
David SHainidze
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195
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16 answers

Slow boot - "a start job is running for dev-disk-by..."

I don't recall when the issue started to occur but it's likely when I moved my VMWare Ubuntu image to an external SSD so that I can use the OS on any of my PCs. There aren't many links on Google about the issue but the ones that appear talk about…
cpd1
  • 2,503
187
votes
4 answers

How can I tell if my system was booted as EFI/UEFI or BIOS?

How do I determine whether a particular running Ubuntu system was booted using EFI/UEFI, or BIOS?
Alexander Trauzzi
  • 2,288
163
votes
6 answers

What do the nomodeset, quiet and splash kernel parameters mean?

What do Kernel command line parameters (also also known as boot options) mean? When you go to Ubuntu (or better, GRUB) options, you have things like nomodeset, quiet and splash. What do these options mean? I am also interested in other parameters…
Star OS
  • 2,668
158
votes
21 answers

"dev/sda1: clean, ..." This message appears after I startup my laptop, then it won't continue booting

dev/sda1: clean, 552599/6111232 files, 7119295/24414464 blocks After I turn on my laptop this message appears. The system never boots, the message just stays there.
El-Dow
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