I have BBB with 4GB eMMC. I successfully installed Ubuntu 18.04 using "BBB-eMMC-flasher-ubuntu-18.04.1-console-armhf-2018-12-10-2gb.img.xz" Then I attempted to install LXDE with the following result:
"depmod: ERROR: could not open directory /lib/modules/4.19.8-armv7-x11: No such file or directory"
with several other related messages following.
ubuntu@arm:/opt/scripts/tools$ sudo ./version.sh
git:/opt/scripts/:[d9a7ff1063db8359841c0349caf0898fd0bbc452]
eeprom:[A335BNLT00C04718BBBK1E85]
model:[TI_AM335x_BeagleBone_Black]
dogtag:[
rcn-ee.net console Ubuntu Image 2018-12-10]
bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 2018.09-00002-gd5b4c4b656]:[location: dd MBR]
kernel:[4.14.79-ti-r84]
uboot_overlay_options:[enable_uboot_overlays=1]
uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-UIO-00A0.dtbo]
uboot_overlay_options:[enable_uboot_cape_universal=1]
pkg check: to individually upgrade run: [sudo apt install --only-upgrade <pkg>]
pkg:[bb-cape-overlays]:[4.4.20181120.0-0rcnee0~bionic+20181120]
pkg:[bb-wl18xx-firmware]:[1.20180517-0rcnee0~bionic+20180517]
pkg:[kmod]:[24-1ubuntu3.1rcnee0~bionic+20181120]
WARNING:pkg:[librobotcontrol]:[NOT_INSTALLED]
groups:[ubuntu : ubuntu adm kmem dialout cdrom floppy audio dip video plugdev users systemd-journal bluetooth netdev i2c gpio pwm eqep admin spi tisdk weston-launch xenomai cloud9ide]
cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk1p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet cape_universal=enable]
dmesg | grep pinctrl-single
[ 1.270880] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568
dmesg | grep gpio-of-helper
[ 1.282537] gpio-of-helper ocp:cape-universal: ready
END