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How to update my already installed Ubuntu Touch image?

rated 0 times [ 2] [ 0] / answers: 1 / hits: 7506 / 3 Years ago, tue, october 12, 2021, 11:15:24

I noticed today that when I opened the update manager through the system settings in Ubuntu touch running on Nexus 7, it showed no updates. But the I ran the following two commands in the terminal:

sudo apt-get update

sudo apt-get dist-upgrade

Certain updates started getting downloaded, and upon my consent, they were installed.

Why is this so? Why doesn't the over the air updates facility show the updates? I am running the latest daily build image of Ubuntu touch.

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4 Years ago

answered 3 Years ago ardtry · Accepted Answer

Updating through the system settings will do an image upgrade which only works when the image is not in writable image mode.

This rather different than doing a package update through apt-get.

These two mechanisms are mutually exclusive:

Image Based Upgrades work on non writable images (read only filesystem)

Apt get works on writable images

Once on writable image mode the way to get back is to reflash the system (not necessarily losing your user data).

adb shell rm /userdata/.writable_image

ubuntu-device-flash [--channel channel_name]

Details on image based upgrades can be read further here: https://wiki.ubuntu.com/ImageBasedUpgrades

There is a third possibility and that's the one that you may have installed a cdimage based image which is writable by default and today is considered an intermediate image to get to the system images.