Update: disabling TPM is enough to allow boot.
>From dmidecode:
Handle 0x000C, DMI type 1, 27 bytes
System Information
Manufacturer: LENOVO
Product Name: 20L8S7X100
Version: ThinkPad T480s
Serial Number: xxx
UUID: xxx
Wake-up Type: Power Switch
SKU Number: LENOVO_MT_20L8_BU_Think_FM_ThinkPad T480s
Family: ThinkPad T480s
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https://bugs.launchpad.net/bugs/1843860
Title:
5.3.0-10 doesn't boot on my t480s with secure boot enabled
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