小编Ada*_*ams的帖子

错误信息：

Please install all available updates for your release before upgrading.

截屏：

内容/etc/update-manager/release-upgrades：

# Default behavior for the release upgrader.

[DEFAULT]
# Default prompting behavior, valid options:
#
#  never  - Never check for, or allow upgrading to, 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 supported release that immediately succeeds the …