Argthtjtr

When I try sudo do-release-upgrade I get:

Traceback (most recent call last):

  File "/usr/bin/do-release-upgrade", line 11, in <module>

    from UpdateManager.Core.MetaRelease import MetaReleaseCore

  File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line 25, in <module>

    import apt

  File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>

    import apt_pkg

ModuleNotFoundError: No module named 'apt_pkg'

Error in sys.excepthook:

Traceback (most recent call last):

  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook

    from apport.fileutils import likely_packaged, get_recent_crashes

  File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>

    from apport.report import Report

  File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>

    import apport.fileutils

  File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>

    from apport.packaging_impl import impl as packaging

  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 23, in <module>

    import apt

  File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>

    import apt_pkg

ModuleNotFoundError: No module named 'apt_pkg'



Original exception was:

Traceback (most recent call last):

  File "/usr/bin/do-release-upgrade", line 11, in <module>

    from UpdateManager.Core.MetaRelease import MetaReleaseCore

  File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line 25, in <module>

    import apt

  File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>

    import apt_pkg

ModuleNotFoundError: No module named 'apt_pkg'

What I've tried so far:

sudo apt update



sudo apt upgrade



sudo dist-upgrade



sudo apt autoremove 



sudo do-release-upgrade



sudo update-manager



apt-get install -f



sudo apt install update-manager



sudo apt install ubuntu-release-upgrader-core



apt-get install python-apt



sudo apt remove python3-apt



sudo apt install python3-apt



sudo apt-get install python3-apt --reinstall



sudo rm -rf /var/lib/apt/lists/*





cd /usr/lib/python3/dist-packages



sudo cp apt_pkg.cpython-34m-i386-linux-gnu.so apt_pkg.so



sudo ln -s apt_pkg.cpython-{35m,34m}-x86_64-linux-gnu.so



sudo ln -s apt_pkg.cpython-{35m,34m}-x86_64-linux-gnu.so apt_pkg.so



/usr/bin/update-manager



sudo apt clean

When I tried:

sudo mv /usr/share/dbus-1/system-services/org.freedesktop.systemd1.service /usr/share/dbus-1/system-services/org.freedesktop.systemd1.service.bak

I got:

mv: cannot stat '/usr/share/dbus-1/system-services/org.freedesktop.systemd1.service': No such file or directory

Of course after doing all that, I again tried:

sudo apt update



sudo apt upgrade



sudo dist-upgrade



sudo apt autoremove 



sudo do-release-upgrade

Still doesn't work.

If you've tried the step-by-step directions from FOSS and it fails, then the alternative is to download the Ubuntu 18.04 ISO and do a clean installation. This has the advantage of removing old Unity packages and settings, since 18.04 uses GNOME.

Of course, this loses all customization and data, so save your data, and also make a disk image, should something go wrong. Having done both upgrades of 16.04 and complete new installations, I find the second choice is faster and easier, despite the disadvantage of requiring data and additional package reinstallation.