sudo sed -i 's/una/vanessa/' /etc/apt/sources.list
sudo sed -i 's/una/vanessa/' /etc/apt/sources.list.d/official-package-repositories.list 
sudo sed -i 's/focal/jammy/' /etc/apt/sources.list.d/official-package-repositories.list 
sudo apt update
sudo apt upgrade
sudo dpkg -i --force-overwrite /var/cache/apt/archives/casper_1.470_amd64.deb 
sudo apt upgrade
sudo apt-get dist-upgrade
sudo apt autoremove
sudo apt-get install perl
sudo apt-get dist-upgrade
sudo apt autoremove
sudo sed -i 's/focal/jammy/' /etc/apt/sources.list.d/*.list 
sudo apt upgrade
sudo apt-get dist-upgrade
sudo apt-get install gvfs-fuse gvfs-backends
sudo apt-get install samba-common-bin samba-libs
sudo apt-get install python3-samba python3-uno
sudo apt-get install nemo-share picard libsmbclient
sudo apt-get install libreoffice libreoffice-script-provider-python
sudo apt-get install kodi
sudo cp /etc/apt/trusted.gpg /etc/apt/trusted.gpg.d
sudo /usr/share/ubuntu-system-adjustments/systemd/adjust-grub-title 
sudo /usr/lib/linuxmint/mintsystem/mint-adjust.py
sudo update-grub
sudo reboot

conf files

/etc/sleep.conf
/etc/mime.types
/etc/ssh/ssh_config

Config changes required after upgrade:
- touchpad enable tap to click
- don't change monitor scale to fraction (125%) but change display resolution instead. Monitor scaling does not work with all apps, particularly not with keepass2/mono.

sudo sed -i 's/vanessa/vera/' /etc/apt/sources.list
sudo sed -i 's/vanessa/vera/' /etc/apt/sources.list.d/official-package-repositories.list 
sudo apt update
sudo apt upgrade
sudo apt-get dist-upgrade
sudo apt autoremove
sudo /usr/share/ubuntu-system-adjustments/systemd/adjust-grub-title 
sudo /usr/lib/linuxmint/mintsystem/mint-adjust.py
sudo update-grub
sudo reboot

Can be done via GUI update manager.

Manual update probably by replacing “vera” with “victoria” in apt sources.

Mint 21.2 Victoria to 21.3 Virginia upgrade:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

#adjust official repo to:
/etc/apt/sources.list.d/official-package-repositories.list 
deb http://packages.linuxmint.com virginia main upstream import backport #id:linuxmint_main

deb http://archive.ubuntu.com/ubuntu jammy main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu jammy-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu jammy-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

apt-get install python3-qrcode python3-typing-extensions python3-async-timeout mint-backgrounds-virginia
apt-get install yt-dlp python3-websockets python3-mutagen python3-brotli
apt-get remove gnome-font-viewer youtube-dl