Error message when I start a batch job

[IT Stranger]

I have created a batch definition sync_Alles.ffs_batch for syncing between varios folder pairs in Ubuntu Linux.

Computer: Ubuntu 20.04 with latest updates.

FreeFileSync works properly in the GUI.

When I try to start the batch in the SSH client, I get the following error message:

gue@antec:~/FreeFileSync$ FreeFileSync sync_Alles.ffs_batch                                
14:15:46: Error: Unable to initialize GTK+, is DISPLAY set properly?


Here is my batch definition sync_Alles.ffs_batch:

<?xml version="1.0" encoding="utf-8"?>
<FreeFileSync XmlType="BATCH" XmlFormat="17">
    <Compare>
        <Variant>TimeAndSize</Variant>
        <Symlinks>Follow</Symlinks>
        <IgnoreTimeShift/>
    </Compare>
    <Synchronize>
        <Variant>Update</Variant>
        <DetectMovedFiles>false</DetectMovedFiles>
        <DeletionPolicy>Permanent</DeletionPolicy>
        <VersioningFolder Style="Replace"/>
    </Synchronize>
    <Filter>
        <Include>
            <Item>*</Item>
        </Include>
        <Exclude>
            <Item>*/.Trash-*/</Item>
            <Item>*/.recycle/</Item>
        </Exclude>
        <TimeSpan Type="None">0</TimeSpan>
        <SizeMin Unit="None">0</SizeMin>
        <SizeMax Unit="None">0</SizeMax>
    </Filter>
    <FolderPairs>
        <Pair>
            <Left>/home/gue/Public/Wortbeiträge</Left>
            <Right>/media/lv_system/Wortbeiträge</Right>
        </Pair>
        <Pair>
            <Left>/home/gue/Public/U-Musik</Left>
            <Right>/media/lv_system/U-Musik</Right>
        </Pair>
        <Pair>
            <Left>/home/gue/Public/Theater</Left>
            <Right>/media/lv_system/Theater</Right>
        </Pair>
        <Pair>
            <Left>/home/gue/Public/Serien</Left>
            <Right>/media/lv_system/Serien</Right>
        </Pair>
        <Pair>
            <Left>/home/gue/Public/NEU</Left>
            <Right>/media/lv_system/NEU</Right>
        </Pair>
        <Pair>
            <Left>/home/gue/Public/Musikvideos</Left>
            <Right>/media/lv_system/Musikvideos</Right>
        </Pair>
        <Pair>
            <Left>/home/gue/Public/Klassik</Left>
            <Right>/media/lv_system/Klassik</Right>
        </Pair>
        <Pair>
            <Left>/home/gue/Public/Kids</Left>
            <Right>/media/lv_system/Kids</Right>
        </Pair>
        <Pair>
            <Left>/home/gue/Public/Jazz</Left>
            <Right>/media/lv_system/Jazz</Right>
        </Pair>
        <Pair>
            <Left>/home/gue/Public/Fotos</Left>
            <Right>/media/lv_system/Fotos</Right>
        </Pair>
        <Pair>
            <Left>/home/gue/Public/Filme</Left>
            <Right>/media/lv_system/Filme</Right>
        </Pair>
        <Pair>
            <Left>/home/gue/Public/Dokumentationen</Left>
            <Right>/media/lv_system/Dokumentationen</Right>
        </Pair>
        <Pair>
            <Left>/home/gue/Public/Daten</Left>
            <Right>/media/lv_system/Daten</Right>
        </Pair>
    </FolderPairs>
    <Errors Ignore="true" Retry="0" Delay="60"/>
    <PostSyncCommand Condition="Errors"/>
    <LogFolder>/home/gue/Public/Daten/backups/Logs_FreeFileSync_Antec</LogFolder>
    <EmailNotification Condition="Always"/>
    <Batch>
        <ProgressDialog Minimized="true" AutoClose="true"/>
        <ErrorDialog>Show</ErrorDialog>
        <PostSyncAction>None</PostSyncAction>
    </Batch>
</FreeFileSync>


Do I misunderstand the functionality of batch jobs in FreeFileSync?

[therube]

Perhaps, Can FFS run on ubuntu without gui or gnome?

[Zenju]

14:15:46: Error: Unable to initialize GTK+, is DISPLAY set properly?

It seems, setting environment variable "DISPLAY=:0" makes GTK happy. Is there some chance FFS could help the user out and set this variable automatically (Without submitting to carco-culting...)? Is there some proper documentation on this somewhere?

[IT Stranger]

Wow, thank you so much for your help. It worked! Now I am able to synchronize folder pairs via SSH.