Hi folks. I have a problem with my Lubuntu laptop. When I suspend the laptop it takes about 5 minutes to wake up again. Cold boot takes around 1. What could be the problem? I'm fairly new to Linux, so please tell me what code should I post, etc.
On Windows it woke up in seconds.
Thanks.

When you say sleep do you mean suspend or hibernate? What command are you sleeping with? Are there any messages in the tty or terminal that say something is running?

If you suspend with
Does it wake up from that? if not what errors or messages does it post?

Also look in the journal

See:
man journalctl
man systemctl

You'll need to give more info.

I just gave 'systemctl suspend' a try and it worked in a second. When I go on the start menu, and click suspend from there, it takes 5 minutes to wake. Is there a way to edit the command given out by the suspend button on the start menu?

Somewhere in the LXDE power management settings there should be an option to choose what to do when the suspend button is pressed (or that menu item is selected). Suspend just keeps the RAM refreshed. Hibernate writes all of RAM to disk, then sleeps. Reading many gigabytes of data from disk can take a long time, and that's probably the setting in use. Change that to suspend and you should have what you want. I'm not up to date on LXDE, so I don't remember the exact way to get into those settings, but the docs/help files should tell you.

Check the config files in /etc/

elogind, lightdm, systemd and more to name. All have their own power management settings inside their own config file. Sometimes when you install a package you can have more than 1 running because of a dependency. You just need edit the configure file.

Depending on your distro, they can be located in different areas.

nano /etc/elogind/logind.conf

nano /etc/lightdm/lightdm.conf

nano /etc/systemd/sleep.conf

You can also use the command

to search for a file or folder containing that name in your current directory recursively.

To know Linux is to know the command line, because GUIs always change and it takes time to learn them, once you learn the command line. Its forever...

Id recommend to start Googling and practicing. You will freak out once you see all the things you can do with Linux that you could never do with Windows.

The entire OS is driven by text and terminal commands. Its a giant OS built on a web of commands that is always being added to.

Also Linux has a memory management system that is generations ahead of Windows. You can install 300 GB of software and still be at almost no CPU usage during operation as the much of the software all use the same dependencies. So programs share each other resources in a much more effective way than windows. There is really no need to worry about memory usage and CPU usage much like Windows. Unless your doing large tasks... Dont be to try new things.

also a pro tip: Dont reinstall to fix a problem, you can always fix it with the CLI. Its a good learning process. After you learn Linux you wont trade it for anything in the world. But if you come to this world to always use the GUI your in the wrong place, keep using the CLI. Your brain will pick it up fast if you got the will power.