This bug seems related with 4.15.0-20, the test result on UEFI model for
different combination of 16.04, 18.04 and their kernel are below:
18.04(d-i not subiquity) with 4.13 kerel: no screen blur
18.04(d-i not subiquity) with 4.15.22 kerenl: no screen blur
16.04 with 4.15.20 kernel screen blur
18.04(d-i) with 4.15.20 kernel screen blur
Notes: 4.13 kernel come from 16.04.4 ISO
4.15.0-22 kernel come from upgrading installed 18.04
screen blur means blur screen picture for language select page
Test with customized ISO which was replaced by vmlinux and initrd (new
kernel)
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https://bugs.launchpad.net/bugs/1762940
Title:
Ubuntu 18.04 d-i install screen becomes blurry on Huawei server in EFI
boot mode
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