Ubuntu: apt error message “Key is stored in legacy trusted.gpg keyring”

After upgrading to Ubuntu 22.04 running apt shows an error message saying “Key is stored in legacy trusted.gpg keyring“: The key needs to be exported from the legacy keyring and then imported back to the current system. List the keys and find the key ID of the repository that is…

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Ubuntu/Debian: Not enough free space on disk ‘/boot’ when updating the OS

My /boot partition is only 512MB and I get this error message every now and then when updating: Not enough free space The upgrade needs a total of xx.x M free space on disk ‘/boot’. Please free at least an additional xx.x M of disk space on ‘/boot’. You can…

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