How to start lightdm services at startup
My system is running Ubuntu 15.04 and I've changed default boot to "text" instead of "quiet splash" by going through answer by @Bruno Pereira How do I disable X at boot time so that the system boots in text mode?.However again I've changed default boot to quiet splash and update-grub but as Ubuntu 15.04 uses systemd my system does not boot to graphical login and stuck at Ubuntu Logo screen.I've to go to the tty1 terminal by CTRL+ALT+F1 and manullay starts Lightdm services as sudo service lightdm start on every login.
How should I change my boot to Graphical login i.e "quiet splash"?
content of sudo gedit /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT="quiet splash"
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX="quiet splash"
# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=1920x1080
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true
# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
First run this command for a graphical environment
sudo systemctl set-default graphical.target
Because you have used sudo systemctl set-default multi-user.target before.
Then repair the entries in /etc/default/grub
This statement is completely wrong:
GRUB_DEFAULT="quiet splash"
Open the configuration:
sudo nano /etc/default/grub
and replace the entry
GRUB_DEFAULT="quiet splash"
with
GRUB_DEFAULT=0
add the entry
GRUB_CMDLINE_LINUX="quiet splash"
After that run
sudo update-grub
-
GRUB_DEFAULT
The default menu entry. This may be a number, in which case it identifies the Nth entry in the generated menu counted from zero, or the title of a menu entry, or the special string ‘saved’. Using the title may be useful if you want to set a menu entry as the default even though there may be a variable number of entries before it.
-
GRUB_CMDLINE_LINUX
Command-line arguments to add to menu entries for the Linux kernel.
-
GRUB_CMDLINE_LINUX_DEFAULT
Unless ‘GRUB_DISABLE_RECOVERY’ is set to ‘true’, two menu entries will be generated for each Linux kernel: one default entry and one entry for recovery mode. This option lists command-line arguments to add only to the default menu entry, after those listed in ‘GRUB_CMDLINE_LINUX’.
Source
It depends on why it doesn't start as a default option. I accidentally purge systemd, so when I reinstall and boot I just have the TTY prompt.
First, you haver to start the service so you can do it graphical:
sudo start lightdm
Once you are in gui mode type in the terminal to reconfigure lightdm:
sudo dpkg-reconfigure lightdm
sudo systemctl set-default graphical.target
Now we need to update the grub so lightdm start a default service
init=/lib/systemd/systemd
To boot under systemd by default, edit /etc/default/grub and change the following line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash init=/lib/systemd/systemd"
After modifying any grub related configuration files like /etc/default/grub the following command is needed to bring the changes into effect.
update-grub
You can see all the instructions in the official ubuntu wiki here, systemd is a services administrator so you will find quite functional