Solved apparmor: systemctl status apparmor shows fail

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apparmor.service - AppArmor initialization
Loaded: loaded (/lib/systemd/system/apparmor.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Tue 2020-05-19 13:50:16 EDT; 48min ago
Docs: man:apparmor(7)
http://wiki.apparmor.net/
Main PID: 642 (code=exited, status=123)

when i try to install any software on terminal it shows me error.

dpkg: error processing package ubuntu-desktop (--configure):
dependency problems - leaving unconfigured
No apport report written because MaxReports is reached already
Errors were encountered while processing:
libpam-systemd:amd64
grub-pc
apparmor
grub-efi-amd64-signed
network-manager
unattended-upgrades
apparmor-utils
xserver-xorg-legacy
ubuntu-standard
network-manager-gnome
gnome-control-center
network-manager-config-connectivity-ubuntu
ubuntu-desktop
E: Sub-process /usr/bin/dpkg returned an error code (1)

How can i solve this problem?

It looks like you might have some missing or corrupt files in your apparmor install. First, make sure you aren't out of disk space. Then, consider removing apparmor and then reinstalling it. I generally do a sudo apt remove apparmor followed by sudo apt purge apparmor and then reinstall with sudo apt install apparmor.