sudo pacman -Sy archlinux-keyring
sudo pacman-key --populate archlinux
sudo pacman-key --refresh-keys
one error you are possibly getting
installing<PKG-HERE> breaks dependency <PKG-HERE>
ERROR FIX FOR:
: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...
error: failed to prepare transaction (could not satisfy dependencies)
:: nvidia: installing nvidia-utils (390.42-1) breaks dependency 'nvidia-utils=390.25'
Boot time increasing over time
After using systemd-analyze a number of users have noticed that their boot time has increased significantly in comparison with what it used to be. After using systemd-analyze blame NetworkManager is being reported as taking an unusually large amount of time to start.
The problem for some users has been due to /var/log/journal becoming too large. This may have other impacts on performance, such as for systemctl status or journalctl. As such the solution is to remove every file within the folder (ideally making a backup of it somewhere, at least temporarily) and then setting a journal file size limit as described in #Journal size limit.