Alt + G is printing 'ã' instead of showing the guide

Also, most of Alt + ... combinations are printing special characters.

I am using Ubuntu 18.04.5 LTS with XFCE 4.12.

I have these settings :
```
LANG=en_US.UTF-8
LANGUAGE=en_US:
```

```
> setxkbmap -query
rules:      evdev
model:      pc105
layout:     us
variant:    altgr-intl
```
