There is a hold on update-manager-kde try opening your terminal and
issue the following command
𝒔𝒖𝒅𝒐 𝒂𝒑𝒕-𝒎𝒂𝒓𝒌 𝒖𝒏𝒉𝒐𝒍𝒅 𝒖𝒑𝒅𝒂𝒕𝒆-𝒎𝒂𝒏𝒂𝒈𝒆𝒓-𝒌𝒅𝒆
Then attempt to update the distro again.
** Changed in: update-manager (Ubuntu)
Status: New => In Progress
** Changed in: update-manager (Ubuntu)
Status: In Progress => Invalid
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https://bugs.launchpad.net/bugs/1400023
Title:
LTS upgrade fails and reverts to previous state
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