mv -v /usr/share/ca-certificates/mozilla/DST_Root_CA_X3.crt /tmp/
'/usr/share/ca-certificates/mozilla/DST_Root_CA_X3.crt' -> '/tmp/DST_Root_CA_X3.crt'
Updating certificates in /etc/ssl/certs...
W: /usr/share/ca-certificates/mozilla/DST_Root_CA_X3.crt not found, but listed in /etc/ca-certificates.conf.
0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
apt list --upgradable | grep "\-security"
apt install -y lsb-release
apt update && apt install -y lsb-release && apt clean all
Check /boot is not 100% full and remove some old kernels, than run:
apt-get -f install
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E5267A6C
apt-get install software-properties-common
ps aux | grep -i apt
root 13794 0.1 0.5 148856 91052 ? S Apr20 58:38 apt-get upgrade -y
E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem
dpkg --configure -a
apt-get --just-print upgrade