This mount option stopped being supported with Linux-libre 5.4.5:
http://ci.guix.gnu.org/build/
2056359/details
* gnu/packages/linux.scm (singularity)[source]: Remove
"errors=remount-ro" mount option from source code.
_ program)
(string-append "/run/setuid-programs/singularity-"
program "-helper")))
+
+ ;; These squashfs mount options are apparently no longer
+ ;; supported since Linux-libre 5.4.5.
+ (substitute* "src/lib/image/squashfs/mount.c"
+ (("\"errors=remount-ro\"")
+ "NULL"))
#t))))
(build-system gnu-build-system)
(arguments