I'm currently running Ubuntu 16.04 in WSL (Windows 10 v1709 or later), installed using
Can I upgrade it to 18.04?
If so, how? If not, when?
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I just forced an upgrade from 16.04 and it was successful, though the process was not all well.
sudo do-release-upgrade -d
First do the upgrade. As people have reported in comments, it's likely all that you need to do before 18.04 is all set up. In a few cases like mine, it will do most of the things while showing as "failed".
In case it shows as "failed", open
/etc/apt/sources.list and replace all "xenial" with "bionic", and
sudo apt update && sudo apt -y upgrade. Most people should have everything done at this point.
In some cases (but not all), APT and Debian Packager may fail during the process. According to this GitHub thread, you need to remove grub and kernels, if present:
sudo apt -f purge grub-pc sudo apt -f purge linux-image*
Repeat the last command several times as dpkg will fail after removing every package. After all those Linux images are removed, you get a fully working Bionic Beaver in your WSL.
Yes, you can!
There are now three varieties of Ubuntu available on the Window Store.
If you installed the plain "Ubuntu" app (with no version number) before 18.04 was made available on the Windows Store, you may upgrade it with the following set of commands:
sudo apt update -y # makes apt system up-to-date sudo apt dist-upgrade -y # upgrades Ubuntu 16.04 packages to latest sudo do-release-upgrade # performs the upgrade to Ubuntu 18.04
Follow all prompts and heed all warnings you are presented with. They are usually due to customizations and third-party libraries or repositories you added yourself.
Disclaimer: This following procedure requires a pre-installed GNU/Linux Distributions in WSL (like OP has Ubuntu 16.04 already installed). The provided links may not work in future. You may comment below if any. It requires little knowledge of GNU/Linux command line tools e.g.
UnsquashFS etc. Install these tools before following this procedure.
Installer Executable: You need an executable importing WslRegisterDistribution function which installs the distribution. There are two ways. You can compile your own installer from source code (link1) or extract the installer from Microsoft provided Appx package(link2).
Get Ubuntu 18.04: Download the Ubuntu 18.04 SquashFS file. Now run old Ubuntu with WSL in that download folder and login as
root user. Run the following commands below (only with root user):
cp ./ubuntu-18.04-server-cloudimg-amd64.squashfs ~ cd ~ unsquashfs -d temp ubuntu-18.04-server-cloudimg-amd64.squashfs cd temp tar -czf ../Ubuntu.tar.gz --hard-dereference * cd .. mv Ubuntu.tar.gz /mnt/c
cp command copies the SquashFS file in home directory (required).
UnsquashFS extracts files in
temp folder and
tar compresses all the files in a
.tar.gz format. Then
mv command move that file in previous download folder. You may delete the
temp folder with
rm -rf ~/temp command.