I think this is the root of the issue:
Investigating plymouth
Package plymouth has broken Depends on libdrm-nouveau1
Considering libdrm-nouveau1 14 as a solution to plymouth 21
Reinst Failed because of xserver-xorg-video-nouveau
Reinst Failed because of libdrm-nouveau1
Removing plymouth rather than change libdrm-nouveau1
Investigating plymouth-theme-ubuntu-text
Package plymouth-theme-ubuntu-text has broken Depends on plymouth
Considering plymouth 21 as a solution to plymouth-theme-ubuntu-text 14
Reinst Failed because of plymouth
Removing plymouth-theme-ubuntu-text rather than change plymouth
Try to Re-Instate libdrm-nouveau1
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https://bugs.launchpad.net/bugs/949560
Title:
Could not calculate the upgrade Could not calculate the upgrade Could
not calculate the upgrade
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