failure in getting submodules

[masatake]

$ ./codebase clone C++
...
remote: Enumerating objects: 25926, done.
remote: Counting objects: 100% (3863/3863), done.
remote: Compressing objects: 100% (837/837), done.
remote: Total 25926 (delta 2975), reused 3840 (delta 2969), pack-reused 22063
Receiving objects: 100% (25926/25926), 84.76 MiB | 13.84 MiB/s, done.
Resolving deltas: 100% (18902/18902), done.
Submodule 'examples/gnss_fw' (https://github.com/sergeykhbr/gnss_fw) registered for path 'examples/gnss_fw'
Submodule 'rtl/gnsslib/gnss_ss' (https://github.com/sergeykhbr/gnss_ss) registered for path 'rtl/gnsslib/gnss_ss'
Cloning into '/home/yamato/var/codebase/code/riscv_vhdl/examples/gnss_fw'...
Gtk-Message: 07:01:58.662: Failed to load module "pk-gtk-module"
Username for 'https://github.com': error: unable to read askpass response from '/usr/libexec/openssh/gnome-ssh-askpass'

Gtk-Message: 16:46:07.207: Failed to load module "pk-gtk-module"
error: unable to read askpass response from '/usr/libexec/openssh/gnome-ssh-askpass'
Password for 'https://github.com': 
remote: Repository not found.
fatal: Authentication failed for 'https://github.com/sergeykhbr/gnss_fw/'
fatal: clone of 'https://github.com/sergeykhbr/gnss_fw' into submodule path '/home/yamato/var/codebase/code/riscv_vhdl/examples/gnss_fw' failed
Failed to clone 'examples/gnss_fw'. Retry scheduled
Cloning into '/home/yamato/var/codebase/code/riscv_vhdl/rtl/gnsslib/gnss_ss'...
Gtk-Message: 16:46:27.747: Failed to load module "pk-gtk-module"
error: unable to read askpass response from '/usr/libexec/openssh/gnome-ssh-askpass'
Username for 'https://github.com': 
Gtk-Message: 16:46:34.959: Failed to load module "pk-gtk-module"
error: unable to read askpass response from '/usr/libexec/openssh/gnome-ssh-askpass'
Password for 'https://github.com': 
remote: Repository not found.
fatal: Authentication failed for 'https://github.com/sergeykhbr/gnss_ss/'
fatal: clone of 'https://github.com/sergeykhbr/gnss_ss' into submodule path '/home/yamato/var/codebase/code/riscv_vhdl/rtl/gnsslib/gnss_ss' failed
Failed to clone 'rtl/gnsslib/gnss_ss'. Retry scheduled
Cloning into '/home/yamato/var/codebase/code/riscv_vhdl/examples/gnss_fw'...
Gtk-Message: 16:46:39.766: Failed to load module "pk-gtk-module"
error: unable to read askpass response from '/usr/libexec/openssh/gnome-ssh-askpass'
Username for 'https://github.com': 
Gtk-Message: 16:46:41.797: Failed to load module "pk-gtk-module"
error: unable to read askpass response from '/usr/libexec/openssh/gnome-ssh-askpass'
Password for 'https://github.com': 
remote: Repository not found.
fatal: Authentication failed for 'https://github.com/sergeykhbr/gnss_fw/'
fatal: clone of 'https://github.com/sergeykhbr/gnss_fw' into submodule path '/home/yamato/var/codebase/code/riscv_vhdl/examples/gnss_fw' failed
Failed to clone 'examples/gnss_fw' a second time, aborting
ERROR:  failed to update git submodule: https://github.com/sergeykhbr/riscv_vhdl.git