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/boot/efi running out of space

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I'm on Ubuntu 20.04 and my /boot/efi partition is running out of space. It's weird because my EFI partition is 512M large and my /boot/efi is less than 100MB. Below are the details:

Partitions:

$ fdisk -l
Disk /dev/nvme0n1: 476.96 GiB, 512110190592 bytes, 1000215216 sectors
Disk model: Samsung SSD 960 PRO 512GB               
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: D3F3E79E-BF80-4C71-A475-41025C66085C

Device           Start        End   Sectors   Size Type
/dev/nvme0n1p1    2048    1050623   1048576   512M EFI System
/dev/nvme0n1p2 1050624 1000214527 999163904 476.4G Linux filesystem

File system info:

$ df /dev/nvme0n1p1
Filesystem     1K-blocks  Used Available Use% Mounted on
/dev/nvme0n1p1     98304 98301         3 100% /boot/efi

Size of /boot/efi:

$ du /boot/efi -sh
96M /boot/efi

I get that FS needs some space for its data structures but 412M out of 512M sounds unreasonable.

Any idea why this is the case and how I can make more space available?

mangohost

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