Not having luck on Fangtooth either (an upgrade install, things worked fine on Electric Eel).
So far I’m trying to just do the same steps again and the following happens when doing install_dev_tools:
[...]
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up gasket-dkms (1.0-18) ...
Removing old gasket-1.0 DKMS files...
Deleting module gasket-1.0 completely from the DKMS tree.
Loading new gasket-1.0 DKMS files...
Deprecated feature: REMAKE_INITRD (/usr/src/gasket-1.0/dkms.conf)
Building for 6.12.15-production+truenas
Building initial module for 6.12.15-production+truenas
Deprecated feature: REMAKE_INITRD (/var/lib/dkms/gasket/1.0/source/dkms.conf)
Error! Bad return status for module build on kernel: 6.12.15-production+truenas
(x86_64)
Consult /var/lib/dkms/gasket/1.0/build/make.log for more information.
dpkg: error processing package gasket-dkms (--configure):
installed gasket-dkms package post-installation script subprocess returned erro
r exit status 10
Errors were encountered while processing:
gasket-dkms
E: Sub-process /usr/bin/dpkg returned an error code (1)
and the logfile /var/lib/dkms/gasket/1.0/build/make.log says:
Thu May 8 21:21:29 PDT 2025
make: Entering directory '/usr/src/linux-headers-truenas-production-amd64'
CC [M] /var/lib/dkms/gasket/1.0/build/gasket_core.o
CC [M] /var/lib/dkms/gasket/1.0/build/gasket_ioctl.o
CC [M] /var/lib/dkms/gasket/1.0/build/gasket_interrupt.o
CC [M] /var/lib/dkms/gasket/1.0/build/gasket_page_table.o
CC [M] /var/lib/dkms/gasket/1.0/build/gasket_sysfs.o
CC [M] /var/lib/dkms/gasket/1.0/build/apex_driver.o
/var/lib/dkms/gasket/1.0/build/gasket_core.c:1376:19: error: 'no_llseek' undeclared here (not in a function); did you mean 'noop_llseek'?
1376 | .llseek = no_llseek,
| ^~~~~~~~~
| noop_llseek
make[2]: *** [scripts/Makefile.build:229: /var/lib/dkms/gasket/1.0/build/gasket_core.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/usr/src/linux-headers-truenas-production-amd64/Makefile:1940: /var/lib/dkms/gasket/1.0/build] Error 2
make: *** [Makefile:227: __sub-make] Error 2
make: Leaving directory '/usr/src/linux-headers-truenas-production-amd64'