The acpi -b error you have reported most probably indicate an ACPI type issue.
ACPI is an open-standard for device and power-management.
Some laptops (most googled that I found were Acer) incorrectly report its battery details to Ubuntu. I'm not sure of your laptop type and model - nor its BIOS version.
Sometimes you need to compile your own kernel with a fixed DSDT table.
Sometimes you need to upgrade your BIOS to the very latest offered by your manufacturer.
If you decide on the latter action you should remember that updating the BIOS of a motherboard or laptop is always a risky operation, because if something goes wrong, the risk of irreparably damaging the hardware is very high.
You will need to follow the instructions for BIOS updates from your manufacturer.