Ubuntu 20.04通过Snap安装Viber遇权限拒绝及资源缺失错误

我尝试了Snap提供的两款Viber包：viber-unofficial.viber和viber-mtd.viber，二者均出现完全相同的WebEngine资源未找到错误，错误日志如下：

sh: 1: xdg-mime: not found
Qt WebEngine ICU data not found at /snap/viber-unofficial/37/opt/viber/resources. Trying parent directory...
Qt WebEngine resources not found at /snap/viber-unofficial/37/opt/viber/resources. Trying parent directory...
[557326:557326:1013/081811.896484:FATAL:credentials.cc(155)] Check failed: NamespaceUtils::DenySetgroups(). : Permission denied
#0 0x7f5a59d4d11e base::debug::StackTrace::StackTrace()
#1 0x7f5a59d5dbde logging::LogMessage::~LogMessage()
#2 0x7f5a59d5de99 logging::ErrnoLogMessage::~ErrnoLogMessage()
#3 0x7f5a5aa4ff7c sandbox::(anonymous namespace)::SetGidAndUidMaps()
#4 0x7f5a5aa505d5 sandbox::Credentials::CanCreateProcessInNewUserNS()
#5 0x7f5a599c0de5 content::ZygoteHostImpl::Init()
#6 0x7f5a59673314 content::BrowserMainLoop::EarlyInitialization()
#7 0x7f5a59677190 content::BrowserMainRunnerImpl::Initialize()
#8 0x7f5a5947cd19 QtWebEngineCore::WebEngineContext::WebEngineContext()
#9 0x7f5a5947e135 QtWebEngineCore::WebEngineContext::current()
#10 0x7f5a5941b931 QtWebEngineCore::BrowserContextAdapter::defaultContext()
#11 0x7f5a6258c618 QQuickWebEngineProfile::defaultProfile()
#12 0x0000006ac8bf ApplicationPrivate::preRunningInitialization()
#13 0x0000006a6504 ViberApplication::start()
#14 0x00000067e25b ViberMain()
#15 0x7f5a56403840 __libc_start_main
#16 0x0000004d7047 <unknown>

Qt WebEngine ICU data not found at /snap/viber-unofficial/37/opt/viber/resources. Trying parent directory...
Qt WebEngine resources not found at /snap/viber-unofficial/37/opt/viber/resources. Trying parent directory...

检查了相关目录权限，未发现明显异常，仅Snap包内所有文件均为root/root所有，普通用户无写入权限。

内容的提问来源于stack exchange，提问作者JensenHealey907