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Currently, the lightdm is burning up too much CPU resource on my computer and from the searches I've done, it's a heavy display manager. Example, just having wunderlist web page open in firefox, the lightdm shoots up to 50cpu alone on Unity. But on Lubuntu desktop environment, it's berable like 14-20cpu.

My computer really isn't that ancient as I don't really have display issues with Windows 8.1. I'm currently running Lubuntu D.E but I really like to use Unity.

Is it possible to run lxdm display manager on Unity? I only installed lxdm which was 800kb but it failed to start. Gave me issues like these,

Failed to start lxdm.service

running {systemctl status lxdm.service}

Loaded: Error
Active: Inactive

I installed {ldxm} with the following command

sudo apt-get --no-install-recommends install lxdm

Ubuntu 15.04

3.19.0-21-generic #21-Ubuntu SMP Sun Jun 14 18:31:11 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Update

I have done dpkg reconfigure method of selecting lxdm, it boots and the entire UI is in crash like phase. Like there are no Windows border. I have given up now and going to stick with lightdm until I feel I need to leave entire distro and move on to Linuxmint mate or Linux Lite

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For each xserver you can only run one display manager at a time. When installing a new display manager on the command line you usually get a dialog asking which one you want by defualt. To run this again you can try running sudo dpkg-reconfigure lxdm and should get a dialog and select lxdm instead of lightdm as the display manager. Although unity is a heavier desktop environment that could use resources in lightdm.

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  • Enabling lxdm by service lightdm stop service lxdm start. But it won't start Then I ran dpkg configure and put lxdm as default. The login occurs like in xfce but a few miles later the things bugs to splash screen. Doing alt cntrl f1 showed the fullscreen terminal for a split second before reverting back to splash screen. I had to reboot and get back to login screen and revert back lightdm from there.
    – user280930
    Jul 24 '15 at 3:50

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