Bug 427394

Summary:	Calamares no longer works on 1 CPU
Product:	[KDE Neon] neon	Reporter:	The Feren OS Dev <ferenosdev>
Component:	Packages User Edition	Assignee:	Neon Bugs <neon-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	groot, jr, nate, neon-bugs-null, sitter
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	Calamares 3.2.31
Sentry Crash Report:

Description The Feren OS Dev 2020-10-06 18:22:55 UTC

SUMMARY
After updating to Calamares 3.2.30, Calamares no longer functions unless you have 2 or more CPU cores. It gets stuck on 'Checking module requirements...' when using the '-d' flag.

STEPS TO REPRODUCE
1. Make an ISO with the latest version of Calamares, of Neon's compiling, in it
2. Boot into the ISO using a VM (or potentially machine too) with just one CPU core
3. Launch Calamares

OBSERVED RESULT
Calamares gets stuck. Using '-d' shows that it's stuck on that aforementioned line.

EXPECTED RESULT
Calamares functioning just fine

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: KDE neon User Edition 5.19.5 (in the screenshot shown below it's Feren OS on 20.04 using KDE neon User Edition 5.19.5's packages)
(available in About System)
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.15.0

ADDITIONAL INFORMATION
ArcoLinux has also been encountering this exact same issue.

Also when I compiled Calamares manually myself ahead of Neon compiling this version of Calamares (I compiled 3.2.30 beforehand) this issue didn't occur.

Comment 1 The Feren OS Dev 2020-10-06 18:24:25 UTC

Screenshot of Feren OS using KDE neon User Edition 5.19.5's packages, including its Calamares package, with this said issue occurring: https://imgur.com/a/OJcpvS8

Comment 2 groot 2020-10-06 20:50:00 UTC

This was fixed in Calamares after 3.2.30, and the fix is in Calamares 3.2.31 (released in about an hour).