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I have installed Ubuntu 22.04 Jammy, and was trying to install ROS1 on it. After a long time of looking for the errors during installation I found out that ROS1 could only be installed on Focal Fossa ( stupid situation, nobody has mentioned it on ROS website in a clear form)

So now I need to switch between the two Ubuntus. I have installed my Ubuntu on an external HDD of 1 TB.

I recreated the bootable USB from Ubuntu focal Fossa, but when I restart the laptop and press F12, and choose the USB device, it only takes me to the dual boot menu, without giving me the possibility of installation. I have not formatted my external HDD. should I do that? since when I open it on Windows I see only 500 GB free space.

FabioSpaghetti
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  • Ok thank you , so how can I format my external hdd from current Ubuntu jammy and install the other one? Currently it does not allow to bring the install option up – FabioSpaghetti Dec 19 '22 at 19:45
  • I think I was not clear, Ubuntu is installed on external hdd. How do I remove this Ubuntu when I'm on windows 10 which is on laptop hdd? – FabioSpaghetti Dec 19 '22 at 20:35
  • When I restart, and press F12, while the external hdd is connected, the Ubuntu installation does not come up – FabioSpaghetti Dec 19 '22 at 20:36
  • Yes, restore your backups. You can re-install a Ubuntu Desktop release without loss of files, and having manually installed packages auto-reinstall (if from Ubuntu repositories) which can be used (you're just using an older release in the install), but problems can be experienced going to older releases as it's unsupported. You need to check each package manually to ensure it can deal with data touched by a newer version, as some (very few actually but if you value your data you need to check!) to ensure no ill side effects will be encountered first (ie. homework required) – guiverc Dec 19 '22 at 21:35
  • I think you did not notice my point: How do I wipe the Ubuntu jammy from my external HDD? when I connect this hard drive with my Windows 10 on, I see only 500MB empty disk, and formatting it does not bring the 1TB back to reinstall Ubuntu Fossa – FabioSpaghetti Dec 19 '22 at 23:23
  • You mention formatting but don't specify what you formatted. You can format partitions (ie. divisions of a drive thus can be any size less than the total capacity of the total drive), or create a new partition table. If you've lost part of the capacity of your drive (however it is), I'd firstly validate the health of the drive using SMART, then create a new partition table on the drive so you're starting again. You can then format partitions using that new partition table & create new partitions up to total size. – guiverc Dec 19 '22 at 23:57
  • I have windows 10 installed on my laptop,and Ubuntu on my external hdd. I want to remove Ubuntu from my external hdd. But when I plug the external hdd I don't see the contents of Ubuntu. I only see an empty hdd with a small volume. So how do I remove it? Using DISK on USB live? Should I create it in windows? – FabioSpaghetti Dec 20 '22 at 08:28
  • @Nmath Well I was not familiar with them and someone helped me with them. I used first partition manager of windows to delete the partitions created on external HDD. then used AOMEI to create new partitions – FabioSpaghetti Dec 20 '22 at 22:40

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