Clear Linux, the Intel developed GNU/Linux distribution optimized for Intel processors and particularly suited for containerized applications, recently has made progress in developing the OS to make it usable as a desktop OS in addition to its capabilities as a cloud, server, and container platform. Unfortunately for desktop GNU/Linux users that mulit-boot, it has not made enough progress such that installation is a trivial task, as it is with other established Linux distributions even for complicated setups in regard to partitioning and allocating partitions to be used for the installation.
Note: Although this article was published on June 4, 2019, it was based on use of Clear Linux 28210 and its updated builds between March 8, 2019 and April 26, 2019. A new GUI installer has been released by Clear Linux recently and is included in its installation images. This may solve some of the limitations I encountered during installation of the distribution, but from the screenshots I have seen, it seems to be only an interface change.
In my initial attempt to install ClearLinux version 28020 on bare metal I encountered two complications:
The Clear Linux documentation does state that the Clear Linux must be the first OS installed on a computer, without detailing the nature of the requirement -- not mentioning the limitations mentioned above. When I browsed the documentation, I assumed that it was simply because the CLear Linux installation would only overwrite the EFI System Partition, not the entire disk.
My initial desire, before I discoverd these limitations in the installer, was to replace an existing Linux root filesystem partition on the primary SSD of the Acer V15 Nitro Black Edition VN7-592G-70EN with the Clear Linux root filesystem, replace an existing Linux home filesystem partition on the secondary HD, use an existing swap partition on the secondary HD, and use the existing EFI System Partition on the primary SSD -- easily achievable on most distributions. Not so on Clear Linux. After numerous attempts to assign partitions from the two disks, in the Installer and the Live Desktop images, I decided to only select existing partitions from the second disk, including a small partition properly formatted and configured for use as an EFI System Partition on the second disk that I use as a backup of the one on the primary disk. This time the selections were accepted, but I was presented with the following screen, warning me that proceeding will delete the entire disk!
As I really wanted to try Clear Linux on bare metal as opposed to on a virtual machine, and the only computer available to me besides the Acer V15 Nitro was an old Toshiba with a first generation Core-i3, I decided to reconfigure the partitions on the Acer by relocating the OEM Windows installation and its recovery partition to the secondary drive and installing Clear Linux on the primary SSD, allocating 35 GB of the available 128GB -- 118 GB after formatting -- to a Clear Linux root partition and a Clear Linux home partition, with a plan to relocate this home partition to the secondary partition after installation. The remaining space on the SSD would be available to two other root partitions of whatever distributions I would install after Clear Linux and a the new EFI partition. Ordinarily I would have placed the home partition on the secondary drive, but again Clear Linux requires all partitions selected for installation to be on the same disk.
After this relocation, I was able to select the primary SSD for installing Clear Linux specifying appropriately sized partitions for an EFI System Partition, a root filesystem, a home filesystem, and swap space. The instller did not touch the secondary drive where my data lives.
As many seasond Linux users know, this kind of limitation doesn't exist in many modern GNU/Linux distributions. Clear Linux may be at this time have these requirements because it may have evolved from a distribution for containerized applications or some similar specialized use.
Thanks to these hoops I went through, I now have reclaimed the space that was wasted on Windows (I never booted into it), and now can have three Linux installations -- root partitons only, with home partitions on the secondary HD -- instead of two, but at some point I'll need to update the Windows Boot Manager configuration to point to the new ,location, if I want to boot into this relocated Windows installation
Look for the review of Clear Linux and review supplements with installation screenshots and other aspects of Clear Linux.