try 
# chown root: /home/mikef/gentoo/usr/lib64/chromium-browser/chrome-sandbox

perhaps chromium also cares about the group

On 28-06-2019 09:36:59 +0100, Michael Fothergill wrote:
> Many thanks again for your advice.
> 
> I ran the two commands you recommended:
> 
> root@fart:/home/mikef/gentoo#  chmod 4755
> /home/mikef/gentoo/usr/lib64/chromium-browser/chrome-sandbox
> root@fart:/home/mikef/gentoo# chown root
> /home/mikef/gentoo/usr/lib64/chromium-browser/chrome-sandbox
> root@fart:/home/mikef/gentoo# /home/mikef/gentoo/usr/bin/chromium
> [2098:2098:0628/083242.274727:ERROR:zygote_host_impl_linux.cc(89)] Running as
> root without --no-sandbox is not supported. See [1]https://crbug.com/638180.
> root@fart:/home/mikef/gentoo# 
> 
> I also tried running chromium as a user:
> 
> mikef@fart:~$ /home/mikef/gentoo/usr/bin/chromium
> [2105:2105:0628/083309.657067:FATAL:setuid_sandbox_host.cc(157)] The SUID
> sandbox helper binary was found, but is not configured correctly. Rather than
> run without sandboxing I'm aborting now. You need to make sure that
> /home/mikef/gentoo/usr/lib64/chromium-browser/chrome-sandbox is owned by root
> and has mode 4755.
> 
> Maybe I need to talk to the chrome community.....
> 
> Regards
> 
> MF
> 
> 
> 
>  References:
>    1. https://crbug.com/638180
> 
> read_char: errno==EILSEQ; invalid byte sequence for UTF-8: 
-- 
Fabian Groffen
Gentoo on a different level

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