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Running do-release-upgrade, it gets stuck on reading cache

Did a sudo apt-get dist-upgrade before, any ideas?

Edit: Rebooted and decided to let it keep going. Still stuck on reading cache. Search results turning up nothing, can't find anyone that's had a similar problem.

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  • 'Reading Cache' occurs several times. Which time is this? What happend immediately previous?
    – user535733
    Feb 5, 2018 at 15:26
  • First one that comes up. Here's a screenshot of where i'm at: i.imgur.com/vqhXQfc.png. Feb 5, 2018 at 15:27
  • Can you specify more information? For examaple the apt log. CLI: cat var/log/apt/history.log GUI: gedit var/log/apt/history.log Feb 5, 2018 at 15:27
  • Cancel and start again. Release upgrades can be safely cancelled at any time during calculation and downloading. Release-upgrades must not be cancelled later -- during package installation and configuration.
    – user535733
    Feb 5, 2018 at 15:29
  • I've interrupted it more than a few times. Rebooted too. It never gets past it. Feb 5, 2018 at 15:30

3 Answers 3

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I had the same issue.

I also had lots of

NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s!

errors in the system logs.

This answer on the Canonical bug tracker: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1530405/comments/75 helped me solve the issue

I switched from nouveau to nvidia drivers, all CPU stuck issues disapeared and the do-release-upgrade worked.

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So, after messing around since yesterday morning with this, I discovered that all I had to do was run do-release-upgrade with the -p flag for it to proceed past reading cache. Idk why, but it worked and i'm up and running now. If anyone has this problem in the future, try that.

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To address another potential cause, I had the exact symptoms posted in the question and for me it was caused by a customer kernel I was using. Once I switched back to the stock kernel I was able to get passed the reading cache step.

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