bug#41356: Install script fails on Ubuntu 18.04 x86_64: Workaround

[Trevor Lee <begleybrothers@gmail.com>]

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Command:

```bash
sudo /tmp/guix-install.sh
```

Result:

```bash
cp: cannot stat '/root/.config/guix/current
/lib/systemd/system/gnu-store.mount': No such file or directory
chmod: cannot access '/etc/systemd/system/gnu-store.mount': No such file or
directory
```

Workaround:
Comment out `cp` at lines 347-348
Insert @ line 347

```bash
cat <<EOF > /etc/systemd/system/gnu-store.mount
[Unit]
Description=Read-only /gnu/store  for GNU Guix
DefaultDependencies=no
ConditionPathExists=/gnu/store
Before=guix-daemon.service

[Install]
WantedBy=guix-daemon.service

[Mount]
What=/gnu/store
Where=/gnu/store
Type=none
Options=bind,ro
EOF
```

HTH

-- 
Kind Regards

Begley Brothers Inc.


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