Kernel startup is slow (Ubuntu 18.04 and Linux Mint 19)

Faced the issue that my laptop startup on Ubuntu 18.04 and Linux Mint 19 takes more than a minute. The reason is that the kernel startup takes more than 40 seconds. To check it execute the next command: $ systemd-analyze This should print out something like: Startup finished in 40.293s (kernel) + 20.524s (userspace) = 1min 818ms reached after 20.498s in userspace To fix this proble, open resume file for edition: $ sudo nano /etc/initramfs-tools/conf.d/resume And replace a line: RESUME=UUID=1d55ee77-cf0b-70f6-77e9-05582ff0df77 With the next line: RESUME=none And then execute the next command to apply changes: $ sudo update-initramfs -u This command will take significant time, be patient and do not interrupt this process. After successful applying, reboot the system: $ sudo reboot After reboot let's check startup time again: $ systemd-analyze Startup finished in 9.121s (kernel) + 25.787s (userspace) = 34.909s reached after 22.528s in userspace

Creating a swapfile

Apparently swap partition does not work on Ubuntu 18.04 and Linux Mint 19. To solve this problem I've created a swapfile 1. Create a swapfile and fill it with zeros: $ sudo dd if=/dev/zero of=/swapfile bs=1M count=2048 2. Prepare swapfile for usage: $ sudo mkswap /swapfile $ sudo chmod 600 /swapfile 3. Add it to fstab $ sudo nano /etc/fstab With the next line: /swapfile none swap sw 0 0 Find and comment out a line with an old swap! Save changes: Ctrl+O, Enter Exit from the editor: Ctrl+X 4. Activate the swapfile: $ sudo swapon /swapfile 5. Reboot: $ sudo reboot 6. Check after restart: $ sudo swapon --show $ free -h