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Questions tagged [boot]

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

536
votes
21answers
544k views

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 ...
443
votes
32answers
1.2m views

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 ...
319
votes
5answers
1.3m views

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 ...
214
votes
6answers
592k views

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

This issue came up recently for me (and I've been prompted to lodge it as a specific question about it): My system is not dual-boot, I run a standard Ubuntu desktop system "on the metal" (I think ...
206
votes
15answers
327k views

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.
179
votes
6answers
555k views

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)?
165
votes
5answers
561k views

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 (...
165
votes
3answers
349k views

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 ...
147
votes
3answers
149k views

How do I re-run boot loader?

Running sudo apt-get -f install said that The link /vmlinuz.old is a damaged link and: you may need to re-run your boot loader[grub] Here's the full output: user@chrubuntu:~$ sudo apt-get -f ...
141
votes
4answers
125k views

Ubuntu 14.04 LTS live USB boot error (gfxboot.c32:not a valid COM32R image)

I downloaded Ubuntu 14.04 (64 bit) lts. I made a bootable usb stick. But I keep receiving this error message upon booting: SYSLINUX 4.04 EDD 20110518 Copyright (C) 1994-2011 H. Peter Anvin et al ...
113
votes
1answer
285k views

How do I install Ubuntu on a VirtualBox client from an ISO image?

I have the ISO image file (that is, *.iso) and I am trying to boot my VirtualBox installation with this image. Is it possible? I know how to mount my ISO image to my filesystem (on my host machine), ...
109
votes
3answers
114k views

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?
100
votes
5answers
508k views

How can I dual-boot Windows 10 and Ubuntu on a UEFI HP notebook?

I've got an HP Pavilion Touchsmart notebook that came with Windows 8. I've upgraded to 8.1, and now I want to dual-boot an Ubuntu distribution with Windows 10. When dual-booting with Windows 8.1, the ...
94
votes
3answers
375k views

How to create UEFI-only bootable USB live media?

Having live media that can boot both ways can be a problem when installing Ubuntu onto currently available Windows 8 computers. In other words the key advantage to creating UEFI-only bootable USB ...
86
votes
2answers
85k views

Diskfilter writes are not supported > What triggers this error?

This message occurs when leaving the Grub menu and before the Ubuntu splash screen. How do I fix the problem to clear the message? And what doe is it mean? error: Diskfilter writes are not ...
86
votes
2answers
171k views

How do I disable the boot splash screen, and only show kernel and boot text instead? [duplicate]

I'd like to be able to disable the Ubuntu splash screen that I see on boot with the indicator meter of progress, and replace that with a text-only readout of the boot up process (such as you can get ...
82
votes
14answers
190k views

How to create a bootable USB with multiple ISO images in it

What I want is to create a bootable pen drive that shows GRUB menu and I can select any of the several bootable systems from there to install/run. I have several ISO images that I want to install in ...
81
votes
10answers
135k views

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 ...
79
votes
13answers
256k views

Windows 10 upgrade kills grub and boot-repair doesn't help

I've just upgraded to Windows 10 from Windows 8.1 on my partitioned laptop that has Ubuntu 14.04 installed. Grub no longer appeared on boot so I ran boot-repair from an Ubuntu liveUSB. This didn't ...
79
votes
6answers
142k views

How can I show or hide boot messages when Ubuntu starts?

Is there a way to easily turn on/off showing the boot messages (loading the services) when Ubuntu starts? Is it something in Grub2? I am running 10.04.
74
votes
8answers
187k views

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) ...
72
votes
4answers
102k views

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 ...
72
votes
1answer
21k views

Can I boot a Live USB fully to RAM, allowing me to remove the disk?

I have a live USB made with the standard Ubuntu disk image creator for 16.04 LTS. In the current state, I can boot to this disk, but it still requires the original USB to run properly at all times. ...
71
votes
4answers
330k views

How do I boot into single-user mode from GRUB?

After changing a few lines in xorg.conf, I can no longer boot Ubuntu (I assume it breaks when trying to load up X), so I need a way to boot into a single-user mode. However, there seems to be zero ...
71
votes
5answers
232k views

Windows 10 upgrade led to grub rescue

I was dual-booting Windows 7 and Linux Ubuntu on my desktop, and today is the day they gave out free Windows 10 upgrades. How exciting! I got the update, and it was installing, and I left to go take ...
71
votes
1answer
151k views

How do I boot into a root shell?

When booting to the graphical desktop fails we sometimes are recommended to boot into a "root shell" or to boot in "recovery mode". How do I do that?
70
votes
20answers
150k views

SMBus/ BIOS error while booting Ubuntu in VirtualBox

I am trying to boot Ubuntu 13.04 in VirtualBox, but every time I boot, I get an error that says: SMBus base address uninitialized - upgrade BIOS or use force_addr=0xaddr This happens right after I ...
67
votes
2answers
41k views

Missing parameter in configuration file. Keyword: path

Im trying to boot ubuntu 14.10-server-i386 in a pendrive. But im getting this error when boot from pendrive. Missing parameter in configuration file. Keyword: path What does it mean? How to ...
66
votes
4answers
703k views

GRUB rescue problem after deleting Ubuntu partition! [duplicate]

After I deleted my Ubuntu partition, I rebooted my computer and I only get a prompt: grub rescue > The command ls lists (hd0) (hd0,msdos5) (hd0,msdos3) (hd0,msdos2) (hd0,msdos1) (hd1) (hd1,...
63
votes
13answers
238k views

“Welcome to emergency mode!” Think it is a fsck problem

journalctl -xb snippet (what i think is wrong, it was at least in red): -- Unit systemd-fsckd.service has begun starting up. juli 09 15:40:16 kim-SSD-Sationary systemd-fsck[414]: /dev/sdb1 contains a ...
61
votes
12answers
90k views

How do I improve boot speed?

I have seen many videos that make Ubuntu faster, but these methods only make desktop performance faster. I am looking to make my computer boot faster. Is their anything I can do to make Ubuntu boot ...
61
votes
4answers
75k views

How do I avoid the “S to Skip” message on boot?

After upgrading my laptop from karmic to lucid, my fat32 partition won't mount automatically. I get the message: The disk drive for /osshare is not ready yet or not present Continue to wait; or Press ...
61
votes
3answers
696k views

How to start GUI from command line?

I've installed the following version of ubuntu om my machine. ubuntu-12.04-desktop-i386.iso But when I switch on the computer, I get command line. Ubuntu 12.04 LTS COMP-1245 tty1 Once I ...
60
votes
7answers
181k views

How do I get my Mac to boot from an Ubuntu USB key?

If you select "USB" and "Mac" on this download page, it gives a series of command line instructions to make a USB key which the MacBook will boot into Ubuntu from. I've followed them to the letter ...
59
votes
4answers
113k views

“Not a COM32R image” error when trying to install from a USB key [duplicate]

Not a COM32R image boot is a message that the console infinitely keeps spitting out when I try to install Ubuntu 10.04 from a USB. I created the USB using the StartupDiskCreator in 11.04. What is ...
59
votes
6answers
76k views

Mount an external drive at boot time only if it is plugged in

I've got an entry for an external harddrive in my fstab: UUID="680C0FE30C0FAAE0" /jgdata ntfs noatime,rw But sometimes this drive isn't plugged in at boot time. This leaves me half way ...
56
votes
3answers
227k views

I need to restart from the root command line [duplicate]

I need help restarting/shutting down from the root command line, any commands I could use? I don't like hard resetting
55
votes
7answers
62k views

“Boot Error” on live-usb flash drive with 15.10

I'm trying to install Ubuntu 15.10 32bits on a Samsung NP-N150-JP05FR, with a live usb created with usb-creator-gtk (from ubuntu 15.10, as superuser) on a FAT32 usb flash drive and get this error : ...
55
votes
3answers
64k views

Why disable Fast Boot on Windows 8 when having dual booting?

Why is everybody keep mentioning to disable Fast Boot on Windows 8 if you have installed alongside Ubuntu? Is it something that is recommended only for UEFI machines or is it a suggestion for Legacy ...
55
votes
4answers
71k views

Enabling Nvidia driver messes up splash screen

When you boot from live CD, or doing the first boot after installing Ubuntu, splash screen looks awesome. But as soon as you enable nvidia-current driver, installed with apt-get, splash screen goes ...
54
votes
3answers
194k views

“intel_rapl: no valid rapl domains” message upon boot

I install fresh Ubuntu 14. 04 server under ESXI 5.1.0. During my installation I did not get any erorrs or strange things. My problem is when I boot machine at console screen I get messages like [ 6....
54
votes
4answers
314k views

Grub rescue - error: unknown filesystem

I have a multiboot system set up. The system has three drives. Multiboot is configured with Windows XP, Windows 7, and Ubuntu - all on the first drive. I had a lot of unpartitioned space left on the ...
53
votes
6answers
58k views

How folders created in /var/run on each reboot

In recent ubuntus (specifically, what interests me the most is 12.04) /var/run is tmpfs, and thus I assume it starts empty with each reboot. Yet, I see there some folders, like /var/run/mysqld and ...
51
votes
5answers
80k views

Why is plymouthd crashing on startup?

Every time my laptop boots, I am greeted by several "Ubuntu 13.10 has experienced an internal error" dialogs once the graphical desktop environment (whatever it's called) is displayed. Apparently the ...
50
votes
6answers
171k views

How to run a script during boot as root

I had a script that automatically enables my wifi without using networkmanager, but I don't know how to run the script as root while the system is booting. How do I make the script run automatically ...
49
votes
10answers
513k views

Uninstall Grub and use Windows bootloader

I have Windows 8 pre-installed and then 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 ...
49
votes
4answers
10k views

How is being able to break into any Linux machine through grub2 secure?

How is the ability of a person who gained physical access to your computer to get root with those steps in any way secure? When grub2 menu opens press e to edit the Linux start options Change: "...
49
votes
5answers
138k views

How do I run update-grub from a LiveCD?

Okay, so I did something stupid. I was trying to clean up my Grub entries, and accidentally removed all of my Linux kernels from Grub (they're still on the hard drive). So now, obviously, Grub doesn'...
49
votes
2answers
52k views

Ubuntu 16.04 final not booting from stick: gfxboot.c32: not a COM32R image [duplicate]

The brand new 16.04 final does not boot from USB stick: Missing parameter in configuration file. Keyword: path gfxboot.c32: not a COM32R image boot : I made a boot stick with Startup Disk Creator on ...
46
votes
7answers
63k views

How to stop mysql from running at boot time?

Currently, my MySQL server starts on every server boot. For a couple reasons, this is undesirable behavior. Is there a way to disable this behavior?