When you’re done make sure you uncomment/put back the sources.list to point at the internet and replace the version with the new one eg. $ sudo apt-get updateīecause you’re not getting the install from the internet and apt isn’t able to trust the source, you will have to accept to install the upgrades by ignoring the security warning. Making sure you do an update first so you read your news sources file. Just continue as you normally would using upgrade/dist-upgrade to deliver your new OS. You may also want to check any source list files under and move them out whilst you upgrade. Take a copy of the original one or just comment out the existing lines. For more information about the team and how it all works, see the Debian wiki page about us. Next we edit the file /etc/apt/sources.list so it only contains the path to our ISO to install from. Who are we The Debian Images Team is a small team of people working on creating, testing and distributing Debian images for you. We have a mounted ISO $ sudo ls -lh /mnt/iso We can then mount the ISO into another folder under /mnt $ sudo mkdir /mnt/iso Now we can see the ISO in the /mnt/usb folder $ sudo ls -lh /mnt/usb You may want to check the output of dmesg to see what device name your stick has been given. How do you upgrade Debian from an ISO without being bootable? Mount the USB Sickįirst mount the USB Drive into your stretch environment so you can use the ISO it contains. But it does have the capacity to hold the Debian DVD ISO #1. Kind of an unusual situation, but I have a Debian jessie box that has a terrible <2MB Internet connection, no CD/DVD and the USB stick I have I don’t want to overwrite and make bootable – it already has things on it I need.
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