Looking at your log files you don't seem to have the linux-generic
package installed and it is failing to install due to a hold on the
package linux-headers-generic. Please resolve this issue by installing
linux-generic and upgrading linux-headers-generic and then trying the
upgrade again.  Thanks!

>From Aptlog.txt:

  MarkInstall linux-generic [ amd64 ] < none -> 4.15.0.32.34 > ( kernel ) FU=1
  Installing linux-headers-generic as Depends of linux-generic
    Ignore MarkInstall of linux-headers-generic [ amd64 ] < 4.4.0.119.125 -> 
4.15.0.32.34 > ( devel ) as its mode (Keep) is protected
Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) linux-generic [ amd64 ] < none -> 4.15.0.32.34 > ( kernel )
Broken linux-generic:amd64 Depends on linux-headers-generic [ amd64 ] < 
4.4.0.119.125 -> 4.15.0.32.34 > ( devel ) (= 4.15.0.32.34)
  Considering linux-headers-generic:amd64 -1 as a solution to 
linux-generic:amd64 9999
  Ignore MarkInstall of linux-headers-generic [ amd64 ] < 4.4.0.119.125 -> 
4.15.0.32.34 > ( devel ) as its mode (Keep) is protected
  Re-Instated linux-headers-generic:amd64
Done

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

** Summary changed:

- Can't do a sys upgrade from 16.04 to 18.04.1 LTS
+ Can't do a sys upgrade from 16.04 to 18.04.1 LTS due to linux-generic not 
being installed

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https://bugs.launchpad.net/bugs/1787658

Title:
  Can't do a sys upgrade from 16.04 to 18.04.1 LTS due to linux-generic
  not being installed

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