note that at do-release-upgrade, there will be a long pause, then an "are you sure prompt" that has to be responded to to complete. Then some goods will be downloaded and another response required.
Upgrade will proceed after that.
$ sudo apt update
$ sudo apt upgrade
$ sudo apt dist-upgrade
$ sudo apt upgrade
$ sudo apt dist-upgrade
$ sudo apt autoremove
Configure the release upgrader. Open and edit the
/etc/update-manager/release-upgrades file and ensure that the Prompt variable is set to normal.
[DEFAULT]
# Default prompting behavior, valid options:
#
# never - Never check for a new release.
# normal - Check to see if a new release is available. If more than one new
# release is found, the release upgrader will attempt to upgrade to
# the release that immediately succeeds the currently-running
# release.
# lts - Check to see if a new LTS release is available. The upgrader
# will attempt to upgrade to the first LTS release available after
# the currently-running one. Note that this option should not be
# used if the currently-running release is not itself an LTS
# release, since in that case the upgrader won't be able to
# determine if a newer release is available.
Prompt=normal
# Default prompting behavior, valid options:
#
# never - Never check for a new release.
# normal - Check to see if a new release is available. If more than one new
# release is found, the release upgrader will attempt to upgrade to
# the release that immediately succeeds the currently-running
# release.
# lts - Check to see if a new LTS release is available. The upgrader
# will attempt to upgrade to the first LTS release available after
# the currently-running one. Note that this option should not be
# used if the currently-running release is not itself an LTS
# release, since in that case the upgrader won't be able to
# determine if a newer release is available.
Prompt=normal
$ sudo do-release-upgrade
Reboot the Ubuntu system.
-
--30--
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