Now computer boots up again. Thx
You set me on the right track, but I wasn't able to to enter `tty12` before reinstallation of `suite66-base`.
For reference:
I have deleted `boot`-tree and reinstalled suite66-base in chrooted environment.
66-tree -D boot
pacman -Rnc suite66-base
66-tree -D default
pacman -S suite66-base avahi-suite66 bluez-suite66 cups-suite66 dbus-suite66 dhcpcd-suite66 networkmanager-suite66 sane-suite66
Then enabled default services and reconfigured environment of boot@system.
Previous tree graph (not booting up; in chrooted environment):
Name : boot
Initialized : no
Enabled : no
Starts after : None
Current : no
Allowed : root
Symlinks : svc->source db->source
Contents : /
|-(0,Enabled,classic) tty-earlier@tty12
|-(unitialized,Enabled,oneshot) system-hostname
|-(unitialized,Enabled,oneshot) mount-run
|-(unitialized,Enabled,oneshot) populate-run
|-(unitialized,Enabled,oneshot) mount-tmp
|-(unitialized,Enabled,oneshot) populate-tmp
|-(unitialized,Enabled,oneshot) mount-proc
|-(unitialized,Enabled,oneshot) mount-sys
|-(unitialized,Enabled,oneshot) populate-sys
|-(unitialized,Enabled,oneshot) mount-dev
|-(unitialized,Enabled,oneshot) mount-pts
|-(unitialized,Enabled,oneshot) mount-shm
|-(unitialized,Enabled,oneshot) populate-dev
|-(unitialized,Enabled,oneshot) mount-cgroups
|-(unitialized,Enabled,bundle) 00
|-(unitialized,Enabled,oneshot) system-hwclock
|-(unitialized,Enabled,oneshot) modules-kernel
|-(unitialized,Enabled,oneshot) system-random
|-(unitialized,Enabled,oneshot) modules-system
|-(unitialized,Enabled,oneshot) system-sysctl
|-(0,Enabled,longrun) udevd-log
|-(0,Enabled,longrun) udevd
|-(unitialized,Enabled,oneshot) udevadm
|-(unitialized,Enabled,oneshot) system-fontnkey
|-(unitialized,Enabled,oneshot) devices-btrfs
|-(unitialized,Enabled,bundle) system-Devices
|-(unitialized,Enabled,bundle) all-Mount
|-(unitialized,Enabled,oneshot) system-fsck
|-(unitialized,Enabled,oneshot) mount-fstab
|-(unitialized,Enabled,oneshot) mount-nfs
|-(unitialized,Enabled,bundle) all-System
|-(unitialized,Enabled,oneshot) mount-rw
|-(unitialized,Enabled,oneshot) local-authfiles
|-(unitialized,Enabled,oneshot) local-loop
|-(unitialized,Enabled,oneshot) local-sethostname
|-(unitialized,Enabled,oneshot) local-time
|-(unitialized,Enabled,oneshot) local-tmpfiles
|-(unitialized,Enabled,oneshot) local-rc
|-(unitialized,Enabled,oneshot) local-dmesg
|-(unitialized,Enabled,oneshot) local-locale
|-(unitialized,Enabled,oneshot) mount-netfs
|-(unitialized,Enabled,bundle) all-Local
|-(unitialized,Enabled,oneshot) all-Runtime
|-(unitialized,Enabled,bundle) All
|-(0,Enabled,longrun) tty-rc@tty1
|-(0,Enabled,longrun) tty-rc@tty2
|-(0,Enabled,longrun) tty-rc@tty3
|-(0,Enabled,longrun) tty-rc@tty4
|-(0,Enabled,longrun) tty-rc@tty5
|-(unitialized,Enabled,module) boot@system
Name : default
Initialized : no
Enabled : yes
Starts after : None
Current : yes
Allowed : root
Symlinks : svc->source db->source
Contents : /
|-(0,Enabled,longrun) dbus-log
|-(0,Enabled,longrun) dbus
|-(0,Enabled,longrun) bluetoothd-log
|-(0,Enabled,longrun) bluetoothd
|-(0,Enabled,longrun) cupsd-log
|-(0,Enabled,longrun) cupsd
|-(0,Enabled,longrun) NetworkManager-log
|-(0,Enabled,longrun) NetworkManager
|-(0,Enabled,longrun) logind-log
|-(0,Enabled,longrun) logind
Name : user_services
Initialized : no
Enabled : yes
Starts after : default
Current : no
Allowed : root
Symlinks : svc->source db->source
Contents : /
|-(unitialized,Enabled,oneshot) setenv@sapp
|-(0,Enabled,longrun) svscan@sapp-log
|-(0,Enabled,longrun) svscan@sapp
|-(unitialized,Enabled,module) scandir@sapp
Current graph tree (of booted system):
Name : user-services
Initialized : no
Enabled : no
Starts after : None
Current : no
Allowed : root
Symlinks : svc->source db->backup
Contents : /
├─(unitialized,Disabled,oneshot) setenv@sapp
├─(0,Disabled,longrun) svscan@sapp-log
├─(0,Disabled,longrun) svscan@sapp
└─(unitialized,Disabled,module) scandir@sapp
Name : boot
Initialized : yes
Enabled : yes
Starts after : None
Current : no
Allowed : root
Symlinks : svc->source db->source
Contents : /
├─(256,Enabled,classic) tty-earlier@tty12
├─(up,Enabled,oneshot) system-hostname
├─(up,Enabled,oneshot) mount-run
├─(up,Enabled,oneshot) populate-run
├─(up,Enabled,oneshot) mount-tmp
├─(up,Enabled,oneshot) populate-tmp
├─(up,Enabled,oneshot) mount-proc
├─(up,Enabled,oneshot) mount-sys
├─(up,Enabled,oneshot) populate-sys
├─(up,Enabled,oneshot) mount-dev
├─(up,Enabled,oneshot) mount-pts
├─(up,Enabled,oneshot) mount-shm
├─(up,Enabled,oneshot) populate-dev
├─(up,Enabled,oneshot) mount-cgroups
├─(up,Enabled,bundle) 00
├─(up,Enabled,oneshot) system-hwclock
├─(up,Enabled,oneshot) modules-kernel
├─(up,Enabled,oneshot) system-random
├─(up,Enabled,oneshot) modules-system
├─(up,Enabled,oneshot) system-sysctl
├─(309,Enabled,longrun) udevd-log
├─(523,Enabled,longrun) udevd
├─(up,Enabled,oneshot) udevadm
├─(up,Enabled,oneshot) system-fontnkey
├─(up,Enabled,bundle) all-Mount
├─(up,Enabled,oneshot) system-fsck
├─(up,Enabled,oneshot) mount-fstab
├─(up,Enabled,oneshot) mount-nfs
├─(up,Enabled,bundle) all-System
├─(up,Enabled,oneshot) mount-rw
├─(up,Enabled,oneshot) local-authfiles
├─(up,Enabled,oneshot) local-loop
├─(up,Enabled,oneshot) local-sethostname
├─(up,Enabled,oneshot) local-time
├─(up,Enabled,oneshot) local-tmpfiles
├─(up,Enabled,oneshot) local-rc
├─(up,Enabled,oneshot) local-dmesg
├─(up,Enabled,oneshot) local-locale
├─(up,Enabled,oneshot) mount-netfs
├─(up,Enabled,bundle) all-Local
├─(up,Enabled,oneshot) all-Runtime
├─(up,Enabled,bundle) All
├─(1241,Enabled,longrun) tty-rc@tty1
├─(966,Enabled,longrun) tty-rc@tty2
├─(965,Enabled,longrun) tty-rc@tty3
├─(961,Enabled,longrun) tty-rc@tty4
├─(964,Enabled,longrun) tty-rc@tty5
└─(up,Enabled,module) boot@system
Name : default
Initialized : yes
Enabled : yes
Starts after : boot
Current : yes
Allowed : root
Symlinks : svc->source db->source
Contents : /
├─(1001,Enabled,classic) dhcpcd-log
├─1002,Enabled,classic) dhcpcd
├─(up,Enabled,oneshot) setenv@sapp
├─(1041,Enabled,longrun) svscan@sapp-log
├─(1090,Enabled,longrun) svscan@sapp
├─(up,Enabled,module) scandir@sapp
├─(1048,Enabled,longrun) dbus-log
├─(1064,Enabled,longrun) dbus
├─(1049,Enabled,longrun) avahi-daemon-log
├─(1129,Enabled,longrun) avahi-daemon
├─(1050,Enabled,longrun) cupsd-log
├─(1063,Enabled,longrun) cupsd
├─(1043,Enabled,longrun) logind-log
├─(1127,Enabled,longrun) logind
├─(1051,Enabled,longrun) NetworkManager-log
├─(1130,Enabled,longrun) NetworkManager
├─(1047,Enabled,longrun) bluetoothd-log
└─(1128,Enabled,longrun) bluetoothd
Boot up log (after reinstalling): see attachment b-0741.txt