u-boot build failed on ubuntu 20 LTS.

Tried at least 10 times, even on a clean installation of OS.

Output

2021-08-24 12:17:26 - INFO     - kas 2.5 started
2021-08-24 12:17:26 - INFO     - /repo$ git rev-parse --show-toplevel
2021-08-24 12:17:26 - INFO     - /repo/kas/opt$ git rev-parse --show-toplevel
2021-08-24 12:17:26 - INFO     - /repo$ git rev-parse --show-toplevel
2021-08-24 12:17:26 - INFO     - Using /repo as root for repository meta-iot2050
2021-08-24 12:17:26 - INFO     - /work$ git clone -q https://github.com/ilbers/isar /work/isar
2021-08-24 12:17:31 - INFO     - Repository isar cloned
2021-08-24 12:17:31 - INFO     - /repo$ git rev-parse --show-toplevel
2021-08-24 12:17:31 - INFO     - Using /repo as root for repository meta-iot2050
2021-08-24 12:17:31 - INFO     - /work/isar$ git status -s
2021-08-24 12:17:31 - INFO     - /work/isar$ git rev-parse --verify -q origin/03124cca669f50b682336a0bdf4ede5a4238e144
2021-08-24 12:17:31 - INFO     - /work/isar$ git checkout -q 03124cca669f50b682336a0bdf4ede5a4238e144
2021-08-24 12:17:31 - INFO     - /repo$ git rev-parse --show-toplevel
2021-08-24 12:17:31 - INFO     - Using /repo as root for repository meta-iot2050
2021-08-24 12:17:31 - INFO     - /work/isar$ git checkout -q -B patched-03124cca669f50b682336a0bdf4ede5a4238e144
2021-08-24 12:17:31 - INFO     - /work/isar$ git apply /repo/isar-patches/0001-wic-plugins-Improve-rootfs-u-boot-script_prepend-pas.patch
2021-08-24 12:17:31 - INFO     - Patch applied. (patch path: /repo/isar-patches/0001-wic-plugins-Improve-rootfs-u-boot-script_prepend-pas.patch, repo: isar, patch entry: rootfs-u-boot-fix)
2021-08-24 12:17:31 - INFO     - /work/isar$ git add -A
2021-08-24 12:17:31 - INFO     - /work/isar$ git commit -a --author kas <kas@example.com> -m msg
2021-08-24 12:17:31 - INFO     - [patched-03124cca669f50b682336a0bdf4ede5a4238e144 af3938f] msg
2021-08-24 12:17:31 - INFO     - Author: kas <kas@example.com>
2021-08-24 12:17:31 - INFO     - 1 file changed, 7 insertions(+)
2021-08-24 12:17:31 - INFO     - /repo$ git rev-parse --show-toplevel
2021-08-24 12:17:31 - INFO     - Using /repo as root for repository meta-iot2050
2021-08-24 12:17:31 - INFO     - /work/isar$ /tmp/tmpqohgpye5/get_bb_env /build
2021-08-24 12:17:31 - INFO     - /repo$ git rev-parse --show-toplevel
2021-08-24 12:17:31 - INFO     - Using /repo as root for repository meta-iot2050
2021-08-24 12:17:31 - INFO     - /build$ /work/isar/bitbake/bin/bitbake -c build u-boot-iot2050
Parsing recipes: 100% |##################################################################################################| Time: 0:00:00
Parsing of 49 .bb files complete (0 cached, 49 parsed). 49 targets, 0 skipped, 0 masked, 0 errors.
NOTE: Resolving any missing task queue dependencies
Initialising tasks: 100% |###############################################################################################| Time: 0:00:00
NOTE: No setscene tasks
NOTE: Executing Tasks
ERROR: u-boot-iot2050-2021.04-r0 do_dpkg_build: Error executing a python function in exec_python_func() autogenerated:

The stack trace of python calls that resulted in this exception/failure was:
File: 'exec_python_func() autogenerated', lineno: 2, function: <module>
0001:
*** 0002:do_dpkg_build(d)
0003:
File: '/work/isar/meta/classes/dpkg-base.bbclass', lineno: 178, function: do_dpkg_build
0174:python do_dpkg_build() {
0175:    lock = bb.utils.lockfile(d.getVar("REPO_ISAR_DIR") + "/isar.lock",
0176:                             shared=True)
0177:    bb.build.exec_func("dpkg_do_mounts", d)
*** 0178:    bb.build.exec_func("dpkg_runbuild", d)
0179:    bb.build.exec_func("dpkg_undo_mounts", d)
0180:    bb.utils.unlockfile(lock)
0181:}
0182:
File: '/work/isar/bitbake/lib/bb/build.py', lineno: 251, function: exec_func
0247:    with bb.utils.fileslocked(lockfiles):
0248:        if ispython:
0249:            exec_func_python(func, d, runfile, cwd=adir)
0250:        else:
*** 0251:            exec_func_shell(func, d, runfile, cwd=adir)
0252:
0253:    try:
0254:        curcwd = os.getcwd()
0255:    except:
File: '/work/isar/bitbake/lib/bb/build.py', lineno: 452, function: exec_func_shell
0448:    with open(fifopath, 'r+b', buffering=0) as fifo:
0449:        try:
0450:            bb.debug(2, "Executing shell function %s" % func)
0451:            with open(os.devnull, 'r+') as stdin, logfile:
*** 0452:                bb.process.run(cmd, shell=False, stdin=stdin, log=logfile, extrafiles=[(fifo,readfifo)])
0453:        finally:
0454:            os.unlink(fifopath)
0455:
0456:    bb.debug(2, "Shell function %s finished" % func)
File: '/work/isar/bitbake/lib/bb/process.py', lineno: 182, function: run
0178:        if not stderr is None:
0179:            stderr = stderr.decode("utf-8")
0180:
0181:    if pipe.returncode != 0:
*** 0182:        raise ExecutionError(cmd, pipe.returncode, stdout, stderr)
0183:    return stdout, stderr
Exception: bb.process.ExecutionError: Execution of '/build/tmp/work/iot2050-debian-arm64/u-boot-iot2050/2021.04-r0/temp/run.dpkg_runbuild.33661' failed with exit code 2:
dpkg-buildpackage: info: source package u-boot-iot2050
dpkg-buildpackage: info: source version 2021.04
dpkg-buildpackage: info: source distribution UNRELEASED
dpkg-buildpackage: info: source changed by Unknown maintainer <unknown@example.com>
dpkg-architecture: warning: specified GNU system type aarch64-linux-gnu does not match CC system type x86_64-linux-gnu, try setting a correct CC environment variable
dpkg-source -I --before-build .
dpkg-buildpackage: info: host architecture arm64
fakeroot debian/rules clean
dh clean --parallel
dh_auto_clean
make -j8 distclean
make[1]: Entering directory '/home/builder/u-boot-iot2050/u-boot-2021.04'
make[1]: Leaving directory '/home/builder/u-boot-iot2050/u-boot-2021.04'
dh_clean
dpkg-source -I -b .
dpkg-source: warning: no source format specified in debian/source/format, see dpkg-source(1)
dpkg-source: warning: source directory 'u-boot-2021.04' is not <sourcepackage>-<upstreamversion> 'u-boot-iot2050-2021.04'
dpkg-source: info: using source format '1.0'
dpkg-source: info: building u-boot-iot2050 in u-boot-iot2050_2021.04.tar.gz
dpkg-source: info: building u-boot-iot2050 in u-boot-iot2050_2021.04.dsc
debian/rules build
dh build --parallel
dh_update_autotools_config
dh_autoreconf
dh_auto_configure
debian/rules override_dh_auto_build
make[1]: Entering directory '/home/builder/u-boot-iot2050/u-boot-2021.04'
/usr/bin/make -j 8 iot2050_defconfig
make[2]: Entering directory '/home/builder/u-boot-iot2050/u-boot-2021.04'
HOSTCC  scripts/basic/fixdep
HOSTCC  scripts/kconfig/conf.o
YACC    scripts/kconfig/zconf.tab.c
LEX     scripts/kconfig/zconf.lex.c
HOSTCC  scripts/kconfig/zconf.tab.o
HOSTLD  scripts/kconfig/conf
#
# configuration written to .config
#
make[2]: Leaving directory '/home/builder/u-boot-iot2050/u-boot-2021.04'
/usr/bin/make -j 8 flash.bin
make[2]: Entering directory '/home/builder/u-boot-iot2050/u-boot-2021.04'
scripts/kconfig/conf  --syncconfig Kconfig
UPD     include/config.h
CFG     u-boot.cfg
GEN     include/autoconf.mk.dep
CFG     spl/u-boot.cfg
GEN     include/autoconf.mk
GEN     spl/include/autoconf.mk
UPD     include/generated/dt.h
UPD     include/generated/timestamp_autogenerated.h
UPD     include/config/uboot.release
UPD     include/generated/version_autogenerated.h
HOSTCC  scripts/dtc/dtc.o
HOSTCC  scripts/dtc/flattree.o
HOSTCC  scripts/dtc/fstree.o
HOSTCC  scripts/dtc/data.o
HOSTCC  scripts/dtc/livetree.o
HOSTCC  scripts/dtc/treesource.o
SHIPPED scripts/dtc/pylibfdt/libfdt.i
rm -f scripts/dtc/pylibfdt/_libfdt*.so
PYMOD   scripts/dtc/pylibfdt/_libfdt.so
HOSTCC  scripts/dtc/srcpos.o
HOSTCC  scripts/dtc/checks.o
HOSTCC  scripts/dtc/util.o
LEX     scripts/dtc/dtc-lexer.lex.c
YACC    scripts/dtc/dtc-parser.tab.h
YACC    scripts/dtc/dtc-parser.tab.c
CFGCHK  u-boot.cfg
HOSTCC  scripts/dtc/dtc-lexer.lex.o
HOSTCC  scripts/dtc/dtc-parser.tab.o
CC      lib/asm-offsets.s
CC      arch/arm/lib/asm-offsets.s
Error: You must add new CONFIG options using Kconfig
The following new ad-hoc CONFIG options were detected:
CONFIG_CREATE_ARCH_SYMLINK

Please add these via Kconfig instead. Find a suitable Kconfig
file and add a 'config' or 'menuconfig' option.
make[2]: *** [Makefile:1066: .binman_stamp] Error 1
make[2]: *** Deleting file '.binman_stamp'
make[2]: *** Waiting for unfinished jobs....
UPD     include/generated/asm-offsets.h
UPD     include/generated/generic-asm-offsets.h
HOSTLD  scripts/dtc/dtc
make[2]: Leaving directory '/home/builder/u-boot-iot2050/u-boot-2021.04'
make[1]: *** [debian/rules:17: override_dh_auto_build] Error 2
make[1]: Leaving directory '/home/builder/u-boot-iot2050/u-boot-2021.04'
make: *** [debian/rules:27: build] Error 2
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2
WARNING: exit code 2 from a shell command.


ERROR: Logfile of failure stored in: /build/tmp/work/iot2050-debian-arm64/u-boot-iot2050/2021.04-r0/temp/log.do_dpkg_build.33661
ERROR: Task (/repo/recipes-bsp/u-boot/u-boot-iot2050_2021.04.bb:do_dpkg_build) failed with exit code '1'
NOTE: Tasks Summary: Attempted 51 tasks of which 0 didn't need to be rerun and 1 failed.

Summary: 1 task failed:
/repo/recipes-bsp/u-boot/u-boot-iot2050_2021.04.bb:do_dpkg_build
Summary: There was 1 ERROR message shown, returning a non-zero exit code.
2021-08-24 12:29:21 - ERROR    - Command returned non-zero exit status 1

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Split from Build u-boot brick IOT2050-ADV.