Comment 20 for bug 1794922

I *think* that this bug affects me too:

I am able to boot Lubuntu 18.10 in my Toshiba laptop with 64-bit architecture both in UEFI and BIOS mode.

http://www.toshiba.se/laptops/satellite-pro/c850/satellite-pro-c850-19w/

I used mkusb to create a persistent live drive (using default settings). Maybe your problem depends on the tool you use to create the live drive, or maybe it depends on the particular 64-bit computer, maybe there is another problem.

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lubuntu@lubuntu:~$ test -d /sys/firmware/efi/ && echo efi || echo bios
bios
lubuntu@lubuntu:~$ grep 'model name' /proc/cpuinfo
model name : Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz
model name : Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz
model name : Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz
model name : Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz
lubuntu@lubuntu:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.10
Release: 18.10
Codename: cosmic
lubuntu@lubuntu:~$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 1.9G 0 1.9G 0% /dev
tmpfs 392M 1.4M 391M 1% /run
/dev/sdb4 1.6G 1.6G 0 100% /cdrom
/dev/loop0 1.6G 1.6G 0 100% /rofs
/cow 6.3G 64M 5.9G 2% /
tmpfs 2.0G 6.4M 2.0G 1% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
tmpfs 2.0G 4.0K 2.0G 1% /tmp
tmpfs 392M 8.0K 392M 1% /run/user/999
/dev/sdb5 6.3G 64M 5.9G 2% /media/lubuntu/casper-rw
/dev/sdb1 6.4G 34M 6.4G 1% /media/lubuntu/usbdata
lubuntu@lubuntu:~$ uname -a
Linux lubuntu 4.18.0-10-generic #11-Ubuntu SMP Thu Oct 11 15:07:11 UTC 2018 i686 i686 i686 GNU/Linux
lubuntu@lubuntu:~$
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I tried again, this time *cloning* with mkusb from the iso file to a USB pendrive, and it failed in my Toshiba laptop with 64-bit architecture both in BIOS mode.

The syslinux boot was activated. It booted, but left me with Busybox and the prompt

(initramfs)

Need I tell you, that both the cloned system and the persistent live system boot successfully in my old IBM Thinkpad T41 (using forcepae to make the ancient Pentium M CPU happy).

Persistent live drives by mkusb boot via grub both in UEFI and BIOS mode. So it seems there is a problem to boot via syslinux in 64-bit computers, a problem, that we did not solve before the release.

You can work around it by booting via grub also in BIOS mode. This can be fixed in a convenient way, when you create a persistent live drive with mkusb.