Menu bar missing in Krita
Solution 1:
Then remove Snap'ed version with
snap remove krita
and install older 4.2.9 version using APT:
sudo apt-add-repository universe
sudo apt update
sudo apt install krita
If you need newer 4.4.3 version - try to use FlatPak by
sudo apt-add-repository universe
sudo apt update
sudo apt install flatpak
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak install flathub org.kde.krita